题目内容
看谁算的对.
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12÷
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分析:(1)(4)先把除法变成乘法,再运用乘法结合律简算;
(2)(3)(5)(6)按照从左到右的顺序计算.
(2)(3)(5)(6)按照从左到右的顺序计算.
解答:解:(1)
÷
÷
,
=
×(
×
),
=
×
,
=
;
(2)
×
×
,
=
×
,
=
;
(3)
÷
×
,
=
×
×
,
=
×
,
=
;
(4)12÷
×
,
=12×(
×
),
=12×
,
=
;
(5)
÷
÷
,
=
×
×
,
=
×
,
=
;
(6)
÷
×
,
=
×
,
=
.
| 5 |
| 8 |
| 16 |
| 7 |
| 14 |
| 11 |
=
| 5 |
| 8 |
| 7 |
| 16 |
| 11 |
| 14 |
=
| 5 |
| 8 |
| 11 |
| 32 |
=
| 55 |
| 256 |
(2)
| 3 |
| 8 |
| 5 |
| 6 |
| 24 |
| 35 |
=
| 5 |
| 16 |
| 24 |
| 35 |
=
| 3 |
| 14 |
(3)
| 19 |
| 26 |
| 38 |
| 55 |
| 5 |
| 11 |
=
| 19 |
| 26 |
| 55 |
| 38 |
| 5 |
| 11 |
=
| 55 |
| 52 |
| 5 |
| 11 |
=
| 25 |
| 52 |
(4)12÷
| 3 |
| 5 |
| 3 |
| 25 |
=12×(
| 5 |
| 3 |
| 3 |
| 25 |
=12×
| 1 |
| 5 |
=
| 12 |
| 5 |
(5)
| 5 |
| 8 |
| 7 |
| 12 |
| 7 |
| 10 |
=
| 5 |
| 8 |
| 12 |
| 7 |
| 10 |
| 7 |
=
| 15 |
| 14 |
| 10 |
| 7 |
=
| 150 |
| 98 |
(6)
| 1 |
| 2 |
| 5 |
| 4 |
| 2 |
| 3 |
=
| 2 |
| 5 |
| 2 |
| 3 |
=
| 4 |
| 15 |
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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