题目内容
脱式计算.
(1)[
-(
+
×50%)]÷
(2)
÷[32×(1-
)+
].
(1)[
| 7 |
| 10 |
| 1 |
| 2 |
| 2 |
| 5 |
| 16 |
| 7 |
(2)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)[
-(
+
×50%)]÷
=[
-(
+
)]÷
,
=[
-
]×
,
=0×
,
=0;
(2)
÷[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)
| 39 |
| 5 |
| 5 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 3 |
| 8 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 18 |
| 5 |
=
| 39 |
| 5 |
| 78 |
| 5 |
=
| 1 |
| 2 |
点评:当算式中同时含有中括号与小括号时,要先算小括号里面的,再算中括号里面的.
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