题目内容
计算,我能行.
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|
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8×
|
18÷
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分析:(1)(2)(4)(5)(6)把除法变为乘法,约分计算;
(3)约分计算.
(3)约分计算.
解答:解:(1)
÷
÷
=
×
×5
=12;
(2)
÷
×7
=
×2×7
=8;
(3)
×
×
=
;
(4)
÷
÷
=
×
×
=
;
(5)8×
÷
=8×
×
=6;
(6)18÷
×
=18×
×
=12.
| 9 |
| 10 |
| 3 |
| 8 |
| 1 |
| 5 |
=
| 9 |
| 10 |
| 8 |
| 3 |
=12;
(2)
| 4 |
| 7 |
| 1 |
| 2 |
=
| 4 |
| 7 |
=8;
(3)
| 3 |
| 4 |
| 8 |
| 15 |
| 5 |
| 8 |
| 1 |
| 4 |
(4)
| 5 |
| 8 |
| 7 |
| 12 |
| 10 |
| 7 |
=
| 5 |
| 8 |
| 12 |
| 7 |
| 7 |
| 10 |
=
| 3 |
| 4 |
(5)8×
| 5 |
| 12 |
| 5 |
| 9 |
=8×
| 5 |
| 12 |
| 9 |
| 5 |
=6;
(6)18÷
| 9 |
| 10 |
| 3 |
| 5 |
=18×
| 10 |
| 9 |
| 3 |
| 5 |
=12.
点评:本题考查了学生通过约分对分数四则混合运题目进行简算的能力.
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