题目内容
脱式计算.
(1)[
-(
+
×50%)]÷
(2)
-
÷5×
(3)
÷[32×(1-
)+
].
(1)[
| 7 |
| 10 |
| 1 |
| 2 |
| 2 |
| 5 |
| 16 |
| 7 |
(2)
| 5 |
| 4 |
| 5 |
| 4 |
| 2 |
| 3 |
(3)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
分析:根据分数、小数和百分数的四则混合运算进行计算即可得到答案.
解答:解:(1)[
-(
+
×50%)]÷
=[
-(
+
)]÷
,
=[
-
]÷
,
=0÷
,
=0;
(2)
-
÷5×
=
-
×
,
=
-
,
=1
;
(3)
÷[32×(1-
)+
]
=
÷[32×
+
],
=
÷[12+
],
=
÷
,
=
.
| 7 |
| 10 |
| 1 |
| 2 |
| 2 |
| 5 |
| 16 |
| 7 |
=[
| 7 |
| 10 |
| 1 |
| 2 |
| 1 |
| 5 |
| 16 |
| 7 |
=[
| 7 |
| 10 |
| 7 |
| 10 |
| 16 |
| 7 |
=0÷
| 16 |
| 7 |
=0;
(2)
| 5 |
| 4 |
| 5 |
| 4 |
| 2 |
| 3 |
=
| 5 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
=
| 5 |
| 4 |
| 1 |
| 6 |
=1
| 1 |
| 12 |
(3)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 3 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 78 |
| 5 |
=
| 1 |
| 2 |
点评:此题主要考查的是分数、小数和百分数的四则混合运算.
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