题目内容
用简便方法计算.
(
+
)×27;
×6+
×6;
×57.
(
| 8 |
| 9 |
| 4 |
| 27 |
| 7 |
| 12 |
| 5 |
| 12 |
| 3 |
| 56 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)运用乘法分配律简算.
(3)把57看作56+1,运用乘法分配律简算.
(3)把57看作56+1,运用乘法分配律简算.
解答:
解:(1)(
+
)×27
=
×27+
×27
=24+4
=28
(2)
×6+
×6
=(
+
)×6
=1×6
=6
(3)
×57
=
×(56+1)
=
×56+
=3+
=3
| 8 |
| 9 |
| 4 |
| 27 |
=
| 8 |
| 9 |
| 4 |
| 27 |
=24+4
=28
(2)
| 7 |
| 12 |
| 5 |
| 12 |
=(
| 7 |
| 12 |
| 5 |
| 12 |
=1×6
=6
(3)
| 3 |
| 56 |
=
| 3 |
| 56 |
=
| 3 |
| 56 |
| 3 |
| 56 |
=3+
| 3 |
| 56 |
=3
| 3 |
| 56 |
点评:此题主要考查灵活运用乘法分配律进行简算.
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