题目内容
怎样简便就怎样算
7.8×101
÷
×64-1
×[
-(
-
)]
×0.53+75%×1.47
25×3.2×1.2530
÷
.
7.8×101
| 5 |
| 14 |
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
| 3 |
| 4 |
25×3.2×1.2530
| 5 |
| 14 |
| 15 |
| 14 |
(1)7.8×101,
=7.8×(100+1),
=7.8×100+7.8×1,
=780+7.8,
=787.8;
(2)
| 5 |
| 14 |
| 5 |
| 9 |
=
| 9 |
| 14 |
=41
| 1 |
| 7 |
=40
| 1 |
| 7 |
(3)
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 7 |
| 16 |
=
| 5 |
| 9 |
| 9 |
| 16 |
=
| 5 |
| 16 |
(4)
| 3 |
| 4 |
=0.75×0.53+0.75×1.47,
=0.75×(0.53+1.47),
=0.75×2,
=1.5;
(5)25×3.2×1.25,
=25×(4×0.8)×1.25,
=(25×4)×(0.8×1.25),
=100×1,
=100;
(6)30
| 5 |
| 14 |
| 15 |
| 14 |
=(30+
| 5 |
| 14 |
| 14 |
| 15 |
=30×
| 14 |
| 15 |
| 5 |
| 14 |
| 14 |
| 15 |
=28+
| 1 |
| 3 |
=28
| 1 |
| 3 |
练习册系列答案
相关题目