题目内容
计算.
×
×
÷
÷
15÷
×
.
| 4 |
| 7 |
| 21 |
| 10 |
| 2 |
| 5 |
| 5 |
| 8 |
| 7 |
| 12 |
| 7 |
| 10 |
15÷
| 9 |
| 10 |
| 3 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先约分,再按照分数乘法法则计算;
(2)把连除改为连乘计算;
(3)把除法改为乘法计算.
(2)把连除改为连乘计算;
(3)把除法改为乘法计算.
解答:
解:(1)
×
×
=
×
=
;
(2)
÷
÷
=
×
×
=
;
(3)15÷
×
=15×
×
=10.
| 4 |
| 7 |
| 21 |
| 10 |
| 2 |
| 5 |
=
| 6 |
| 5 |
| 2 |
| 5 |
=
| 12 |
| 25 |
(2)
| 5 |
| 8 |
| 7 |
| 12 |
| 7 |
| 10 |
=
| 5 |
| 8 |
| 12 |
| 7 |
| 10 |
| 7 |
=
| 75 |
| 49 |
(3)15÷
| 9 |
| 10 |
| 3 |
| 5 |
=15×
| 10 |
| 9 |
| 3 |
| 5 |
=10.
点评:混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当运用运算定律简算.
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