题目内容
用递等式计算,能简算的要简算
÷
÷
;
×
+
×
.
| 5 |
| 9 |
| 3 |
| 4 |
| 10 |
| 3 |
| 3 |
| 5 |
| 3 |
| 8 |
| 3 |
| 5 |
| 5 |
| 8 |
分析:(1)把除法改为连乘计算即可;
(2)利用乘法分配律简算.
(2)利用乘法分配律简算.
解答:解:(1)
÷
÷
=
×
×
=
;
(2)
×
+
×
=
×(
+
)
=
×1
=
.
| 5 |
| 9 |
| 3 |
| 4 |
| 10 |
| 3 |
=
| 5 |
| 9 |
| 4 |
| 3 |
| 3 |
| 10 |
=
| 2 |
| 9 |
(2)
| 3 |
| 5 |
| 3 |
| 8 |
| 3 |
| 5 |
| 5 |
| 8 |
=
| 3 |
| 5 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
点评:分数四则混合运算,抓住运算顺序,利用运算定律,正确计算和简算.
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