题目内容
简便计算
|
(
|
|
考点:分数的简便计算
专题:运算定律及简算
分析:利用乘法分配律简算即可.
解答:
解:(1)
×0.375+
÷
=
×0.375+
×
=(
+
)×0.375
=2×0.375
=0.75;
(2)(
-
)×54
=
×54-
×54
=9-5
=4;
(3)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
.
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 9 |
=
| 7 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=(
| 7 |
| 8 |
| 9 |
| 8 |
=2×0.375
=0.75;
(2)(
| 1 |
| 6 |
| 5 |
| 54 |
=
| 1 |
| 6 |
| 5 |
| 54 |
=9-5
=4;
(3)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
点评:此题考查乘法分配律在分数混合运算中运用.
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