题目内容
计算
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(4)(5)(6)把除法变为乘法,约分计算;
(2)约分计算;
(3)调整运算顺序,使计算简便.
(2)约分计算;
(3)调整运算顺序,使计算简便.
解答:
解:(1)
÷6÷
=
×
×
=
(2)
×
×
=
×
=
(3)
×
÷
×
=(
÷
)×(
×
)
=1×
=
(4)
×
÷
=
×
×
=
(5)
÷
×
=
×
×
=
(6)
÷
×
=
×
×
=
| 2 |
| 3 |
| 3 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 6 |
| 4 |
| 3 |
=
| 4 |
| 27 |
(2)
| 9 |
| 11 |
| 1 |
| 27 |
| 11 |
| 18 |
=
| 1 |
| 33 |
| 11 |
| 18 |
=
| 1 |
| 54 |
(3)
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
| 1 |
| 5 |
=(
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
=1×
| 1 |
| 25 |
=
| 1 |
| 25 |
(4)
| 4 |
| 7 |
| 5 |
| 6 |
| 20 |
| 21 |
=
| 4 |
| 7 |
| 5 |
| 6 |
| 21 |
| 20 |
=
| 1 |
| 2 |
(5)
| 7 |
| 10 |
| 3 |
| 8 |
| 10 |
| 7 |
=
| 7 |
| 10 |
| 8 |
| 3 |
| 10 |
| 7 |
=
| 8 |
| 3 |
(6)
| 14 |
| 15 |
| 7 |
| 9 |
| 3 |
| 8 |
=
| 14 |
| 15 |
| 9 |
| 7 |
| 3 |
| 8 |
=
| 9 |
| 20 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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| A、280099 |
| B、280200 |
| C、279820 |
| D、284500 |