题目内容
用简便方法计算,并要写出主要的简算过程.
①
+
+
+
②12.5×8×4×0.25.
①
| 7 |
| 11 |
| 1 |
| 5 |
| 4 |
| 11 |
| 3 |
| 5 |
②12.5×8×4×0.25.
①
+
+
+
=(
+
)+(
+
)
=1+
=1
;
②12.5×8×4×0.25
=(12.5×8)×(4×0.25)
=100×1
=100.
| 7 |
| 11 |
| 1 |
| 5 |
| 4 |
| 11 |
| 3 |
| 5 |
=(
| 7 |
| 11 |
| 4 |
| 11 |
| 1 |
| 5 |
| 3 |
| 5 |
=1+
| 4 |
| 5 |
=1
| 4 |
| 5 |
②12.5×8×4×0.25
=(12.5×8)×(4×0.25)
=100×1
=100.
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