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下面各题能算简便要简算,每题要写出主要的计算过程.(1)3.07×101-3.07(2)4.56+37+4.44+47(3)1.25×3.2×2.5(4)59−(56−712)(5)[(9+0.25)×12]÷30(6)1-[910-(3
题目详情
下面各题能算简便要简算,每题要写出主要的计算过程.
(1)3.07×101-3.07 (2)4.56+
+4.44+
(3)1.25×3.2×2.5 (4)
−(
−
)
(5)[(9+0.25)×12]÷30 (6)1-[
-(
-
)].
(1)3.07×101-3.07 (2)4.56+
3 |
7 |
4 |
7 |
(3)1.25×3.2×2.5 (4)
5 |
9 |
5 |
6 |
7 |
12 |
(5)[(9+0.25)×12]÷30 (6)1-[
9 |
10 |
3 |
4 |
1 |
6 |
▼优质解答
答案和解析
(1)3.07×101-3.07
=3.07×100+3.07-3.07,
=307;
(2)4.56+
+4.44+
=(4.56+4.44)+(
+
),
=9+1,
=10;
(3)1.25×3.2×2.5
=(1.25×0.8)×(2.5×4),
=1×10,
=10;
(4)
−(
−
)
=
−
,
=
;
(5)[(9+0.25)×12]÷30
=[9.25×12]÷30,
=111÷30
=3.7;
(6)1-[
-(
-
)]
=1-[
-
],
=1-
,
=
.
=3.07×100+3.07-3.07,
=307;
(2)4.56+
3 |
7 |
4 |
7 |
=(4.56+4.44)+(
3 |
7 |
4 |
7 |
=9+1,
=10;
(3)1.25×3.2×2.5
=(1.25×0.8)×(2.5×4),
=1×10,
=10;
(4)
5 |
9 |
5 |
6 |
7 |
12 |
=
5 |
9 |
1 |
4 |
=
11 |
36 |
(5)[(9+0.25)×12]÷30
=[9.25×12]÷30,
=111÷30
=3.7;
(6)1-[
9 |
10 |
3 |
4 |
1 |
6 |
=1-[
9 |
10 |
7 |
12 |
=1-
19 |
60 |
=
41 |
60 |
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