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计算,能简便的要简算.(1)7.15+110÷(3.2×2.3)(2)5.6×[10÷(6110−1.8×103)](3)1114÷(364×447−447×294)(4)1+2-3-4+5+6-7-8+9+…+1993(5)58÷[211×(15+16)](6)6÷[1÷(2.1-2.09)].
题目详情
计算,能简便的要简算.
(1)7.15+110÷(3.2×2.3)
(2)5.6×[10÷(
−1.8×
)]
(3)
÷(
×
−
×
)
(4)1+2-3-4+5+6-7-8+9+…+1993
(5)
÷[
×(
+
)]
(6)6÷[1÷(2.1-2.09)].
(1)7.15+110÷(3.2×2.3)
(2)5.6×[10÷(
| 61 |
| 10 |
| 10 |
| 3 |
(3)
| 11 |
| 14 |
| 36 |
| 4 |
| 44 |
| 7 |
| 44 |
| 7 |
| 29 |
| 4 |
(4)1+2-3-4+5+6-7-8+9+…+1993
(5)
| 5 |
| 8 |
| 2 |
| 11 |
| 1 |
| 5 |
| 1 |
| 6 |
(6)6÷[1÷(2.1-2.09)].
▼优质解答
答案和解析
(1)7.15+110÷(3.2×2.3)
=7.15+110÷7
,
=7.15+14
,
=22
;
(2)5.6×[10÷(
−1.8×
)]
=5.6×[10÷(6.1-6)],
=5.6×[10÷0.1],
=5.6×100,
=560;
(3)
÷(
×
−
×
)
=
÷[(
-
)×
],
=
÷[
×
],
=
÷11,
=
;
(4)1+2-3-4+5+6-7-8+9+…+1993
=(1+2-3-4)+(5+6-7-8)+9+…+(1989+1990-1991-1992)+1993,
=-4×498+1993,
=-1992+1993,
=1;
(5)
÷[
×(
+
)]
=
÷[
×
],
=
÷
,
=9
;
(6)6÷[1÷(2.1-2.09)]
=6÷[1÷0.01],
=6÷100,
=0.06.
=7.15+110÷7
| 9 |
| 25 |
=7.15+14
| 87 |
| 92 |
=22
| 11 |
| 115 |
(2)5.6×[10÷(
| 61 |
| 10 |
| 10 |
| 3 |
=5.6×[10÷(6.1-6)],
=5.6×[10÷0.1],
=5.6×100,
=560;
(3)
| 11 |
| 14 |
| 36 |
| 4 |
| 44 |
| 7 |
| 44 |
| 7 |
| 29 |
| 4 |
=
| 11 |
| 14 |
| 36 |
| 4 |
| 29 |
| 4 |
| 44 |
| 7 |
=
| 11 |
| 14 |
| 7 |
| 4 |
| 44 |
| 7 |
=
| 11 |
| 14 |
=
| 1 |
| 14 |
(4)1+2-3-4+5+6-7-8+9+…+1993
=(1+2-3-4)+(5+6-7-8)+9+…+(1989+1990-1991-1992)+1993,
=-4×498+1993,
=-1992+1993,
=1;
(5)
| 5 |
| 8 |
| 2 |
| 11 |
| 1 |
| 5 |
| 1 |
| 6 |
=
| 5 |
| 8 |
| 2 |
| 11 |
| 11 |
| 30 |
=
| 5 |
| 8 |
| 1 |
| 15 |
=9
| 3 |
| 8 |
(6)6÷[1÷(2.1-2.09)]
=6÷[1÷0.01],
=6÷100,
=0.06.
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