题目内容
用递等式计算:
×
×15; 15÷
×
;
÷
÷
;
×2÷
.
| 3 |
| 5 |
| 2 |
| 9 |
| 9 |
| 10 |
| 3 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 6 |
| 9 |
| 13 |
| 9 |
| 10 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)根据乘法交换律和结合律简算即可;
(3)(4)从左向右依次计算即可.
(3)(4)从左向右依次计算即可.
解答:
解:(1)
×
×15
=
×15×
=9×
=2
(2)15÷
×
=15×
÷
=9÷
=10
(3)
÷
÷
=
÷
=1
(4)
×2÷
=
÷
=1
| 3 |
| 5 |
| 2 |
| 9 |
=
| 3 |
| 5 |
| 2 |
| 9 |
| 2 |
| 9 |
=2
(2)15÷
| 9 |
| 10 |
| 3 |
| 5 |
=15×
| 3 |
| 5 |
| 9 |
| 10 |
=9÷
| 9 |
| 10 |
=10
(3)
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 6 |
| 5 |
| 5 |
| 6 |
=1
| 11 |
| 25 |
(4)
| 9 |
| 13 |
| 9 |
| 10 |
=
| 18 |
| 13 |
| 9 |
| 10 |
=1
| 7 |
| 13 |
点评:此题主要考查了分数的四则混合运算,注意运算顺序,注意乘法运算定律的应用.
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