题目内容
| 3 |
| 7 |
| 4 |
| 5 |
| 4 |
| 7 |
| 5 |
| 4 |
(
| 5 |
| 12 |
| 7 |
| 18 |
| 1 |
| 36 |
分析:通过观察,解答此题,都要先把除法改为乘法,然后运用乘法分配律简算.
解答:解:(1)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(2)(
+
)÷
,
=(
+
)×36,
=
×36+
×36,
=15+14,
=29.
| 3 |
| 7 |
| 4 |
| 5 |
| 4 |
| 7 |
| 5 |
| 4 |
=
| 3 |
| 7 |
| 5 |
| 4 |
| 4 |
| 7 |
| 5 |
| 4 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 5 |
| 4 |
=1×
| 5 |
| 4 |
=
| 5 |
| 4 |
(2)(
| 5 |
| 12 |
| 7 |
| 18 |
| 1 |
| 36 |
=(
| 5 |
| 12 |
| 7 |
| 18 |
=
| 5 |
| 12 |
| 7 |
| 18 |
=15+14,
=29.
点评:此题主要考查分数的四则混合运算,注意运用运算定律进行简便计算.
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