题目内容
(2012?茂名)脱式计算.
2÷
×
[1-(
+
)]×36.
2÷
8 |
5 |
25 |
24 |
[1-(
1 |
2 |
1 |
3 |
分析:(1)把除法变为乘法,约分计算;
(2)先算小括号内的,再算中括号内的,最后算括号外的.
(2)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:2÷
×
,
=2×
×
,
=
;
(2)[1-(
+
)]×36,
=[1-
]×36,
=
×36,
=6.
8 |
5 |
25 |
24 |
=2×
5 |
8 |
25 |
24 |
=
125 |
96 |
(2)[1-(
1 |
2 |
1 |
3 |
=[1-
5 |
6 |
=
1 |
6 |
=6.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,细心计算.
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