题目内容
简便计算
17×(
+
)×18-40
1.25×3.2×0.25
7
-(3.875-2.64)
17×(
| 3 |
| 17 |
| 7 |
| 18 |
1.25×3.2×0.25
7
| 7 |
| 8 |
(1)17×(
+
)×18-40,
=17×
×18+17×
×18-40,
=54+119-40,
=173-40,
=133;
(2)1.25×3.2×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;
(3)7
-(3.875-2.64),
=7.875-3.875+2.64,
=4+2.64,
=6.64;
| 3 |
| 17 |
| 7 |
| 18 |
=17×
| 3 |
| 17 |
| 7 |
| 18 |
=54+119-40,
=173-40,
=133;
(2)1.25×3.2×0.25,
=(1.25×0.8)×(4×0.25),
=1×1,
=1;
(3)7
| 7 |
| 8 |
=7.875-3.875+2.64,
=4+2.64,
=6.64;
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