题目内容
(2011?毕节地区)
计算下面各题,要写出计算的主要过程 (1-
|
|
分析:(1)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(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:(1)(1-
×70)÷
,
=(1-
)×
,
=
×
,
=
;
(2)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
×
,
=
.
1 |
100 |
2 |
7 |
=(1-
7 |
10 |
7 |
2 |
=
3 |
10 |
7 |
2 |
=
21 |
20 |
(2)
9 |
20 |
1 |
2 |
2 |
5 |
4 |
5 |
=
9 |
20 |
1 |
2 |
6 |
5 |
=
9 |
20 |
3 |
5 |
=
9 |
20 |
5 |
3 |
=
3 |
4 |
点评:此题主要考查了四则混合运算的运算顺序和运算法则.
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