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(1)923−9923+99923=(2)(38+16−29)×72=(3)4.9×512+4.9+312×4.9=(4)9999+99992=(5)11×12×13-12×13-260=(6)101×99×999+999=(7)514×3.8+6.2×5.25=(8)1880×199.9-1999×187.9=
题目详情
(1)9
−99
+999
=
(2)(
+
−
)×72=
(3)4.9×5
+4.9+3
×4.9=
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
×3.8+6.2×5.25=
(8)1880×199.9-1999×187.9=9
−99
+999
=
(2)(
+
−
)×72=
(3)4.9×5
+4.9+3
×4.9=
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
×3.8+6.2×5.25=
(8)1880×199.9-1999×187.9=
2 2 3 3
2 2 3 3
2 2 3 3
(
+
−
)×72=
(3)4.9×5
+4.9+3
×4.9=
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
×3.8+6.2×5.25=
(8)1880×199.9-1999×187.9=
3 3 8 8
1 1 6 6
2 2 9 9
4.9×5
+4.9+3
×4.9=
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
×3.8+6.2×5.25=
(8)1880×199.9-1999×187.9=
1 1 2 2
1 1 2 2
2
5
×3.8+6.2×5.25=
(8)1880×199.9-1999×187.9=
1 1 4 4
2 |
3 |
2 |
3 |
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
(3)4.9×5
1 |
2 |
1 |
2 |
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
1 |
4 |
(8)1880×199.9-1999×187.9=9
2 |
3 |
2 |
3 |
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
(3)4.9×5
1 |
2 |
1 |
2 |
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
1 |
4 |
(8)1880×199.9-1999×187.9=
2 |
3 |
2 |
3 |
2 |
3 |
(
3 |
8 |
1 |
6 |
2 |
9 |
(3)4.9×5
1 |
2 |
1 |
2 |
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
1 |
4 |
(8)1880×199.9-1999×187.9=
3 |
8 |
1 |
6 |
2 |
9 |
4.9×5
1 |
2 |
1 |
2 |
(4)9999+99992=
(5)11×12×13-12×13-260=
(6)101×99×999+999=
(7)5
1 |
4 |
(8)1880×199.9-1999×187.9=
1 |
2 |
1 |
2 |
2
5
1 |
4 |
(8)1880×199.9-1999×187.9=
1 |
4 |
▼优质解答
答案和解析
(1)9
−99
+999
,
=(9+999-99)+(
+
-
)
=909+
,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 9
2 2 23 3 3−99
2 2 23 3 3+999
2 2 23 3 3,
=(9+999-99)+(
+
-
)
=909+
,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 23 3 3+
-
)
=909+
,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 23 3 3-
)
=909+
,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 23 3 3)
=909+
,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 23 3 3,
=909
;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 23 3 3;
(2)(
+
−
)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. (
3 3 38 8 8+
1 1 16 6 6−
2 2 29 9 9)×72,
=
×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
3 3 38 8 8×72+
×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
1 1 16 6 6×72-
×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 2 29 9 9×72,
=27+12-16,
=23;
(3)4.9×5
+4.9+3
×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 4.9×5
1 1 12 2 2+4.9+3
1 1 12 2 2×4.9,
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+999922,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 5
1 1 14 4 4×3.8+6.2×5.25,
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
2 |
3 |
2 |
3 |
=(9+999-99)+(
2 |
3 |
2 |
3 |
2 |
3 |
=909+
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 9
2 |
3 |
2 |
3 |
2 |
3 |
=(9+999-99)+(
2 |
3 |
2 |
3 |
2 |
3 |
=909+
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
2 |
3 |
2 |
3 |
=909+
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
2 |
3 |
=909+
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
=909+
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
=909
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
3 |
(2)(
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. (
3 |
8 |
1 |
6 |
2 |
9 |
=
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
3 |
8 |
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
1 |
6 |
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
2 |
9 |
=27+12-16,
=23;
(3)4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+99992,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 4.9×5
1 |
2 |
1 |
2 |
=4.9×(5.5+1+3.5),
=4.9×10,
=49;
(4)9999+999922,
=9999×(1+9999),
=9999×10000,
=99990000;
(5)11×12×13-12×13-260,
=(11-1)×12×13-260,
=10×12×13-260,
=1560-260,
=1300;
(6)101×99×999+999,
=999×(101×99+1),
=999×[(100+1)×99+1];
=999×[100×99+99+1],
=999×[9900+99+1],
=999×10000,
=9990000;
(7)5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9. 5
1 |
4 |
=5.25×(3.8+6.2),
=5.25×10,
=52.5;
(8)1880×199.9-1999×187.9,
=1880×199.9-199.9×1879,
=(1880-1879)×199.9,
=1×199.9,
=199.9.
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