题目内容
| 计算 2
|
2
|
1
|
4
|
分析:(1)(3)(4)把带分数化为假分数,除法改为乘法计算即可;
(2)两边同除以2
,再把带分数化为假分数,除法改为乘法计算.
(2)两边同除以2
| 3 |
| 8 |
解答:解:(1)2
÷9
×
=
×
×
=
;
(2)2
x=3
2
x÷2
=3
÷2
x=
×
x=
;
(3)1
×42÷
=
×42×18
=1458;
(4)4
÷1
×
=
×
×
=
.
| 2 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
=
| 12 |
| 5 |
| 6 |
| 59 |
| 5 |
| 6 |
=
| 12 |
| 59 |
(2)2
| 3 |
| 8 |
| 1 |
| 5 |
2
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 5 |
| 3 |
| 8 |
x=
| 16 |
| 5 |
| 8 |
| 19 |
x=
| 128 |
| 95 |
(3)1
| 13 |
| 14 |
| 1 |
| 18 |
=
| 27 |
| 14 |
=1458;
(4)4
| 3 |
| 7 |
| 1 |
| 3 |
| 7 |
| 31 |
=
| 31 |
| 7 |
| 3 |
| 4 |
| 7 |
| 31 |
=
| 3 |
| 4 |
点评:此题考查分数的乘除混合运算,注意把带分数化为假分数,除法改为乘法计算,注意约分的方法与结果.
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