题目内容
脱式计算.
(1)[
-(
+
×50%)]÷
;
(2)
-
÷5×
;
(3)(9.3×
-7.3)÷
;
(4)
÷[32×(1-
)+
].
(1)[
7 |
10 |
1 |
2 |
2 |
5 |
16 |
7 |
(2)
5 |
4 |
5 |
4 |
2 |
3 |
(3)(9.3×
5 |
6 |
9 |
4 |
(4)
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)
-
÷5×
=
-
×
×
,
=
-
,
=
;
(3)(9.3×
-7.3)÷
=(7.75-7.3)×
,
=0.45×
,
=0.2;
(4)
÷[32×(1-
)+
]
=
÷[32×
+
],
=
÷[12+
],
=
×
,
=
.
7 |
10 |
1 |
2 |
2 |
5 |
16 |
7 |
=[
7 |
10 |
1 |
2 |
2 |
5 |
1 |
2 |
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 |
5 |
4 |
1 |
5 |
2 |
3 |
=
5 |
4 |
1 |
6 |
=
13 |
12 |
(3)(9.3×
5 |
6 |
9 |
4 |
=(7.75-7.3)×
4 |
9 |
=0.45×
4 |
9 |
=0.2;
(4)
39 |
5 |
5 |
8 |
18 |
5 |
=
39 |
5 |
3 |
8 |
18 |
5 |
=
39 |
5 |
18 |
5 |
=
39 |
5 |
5 |
78 |
=
1 |
2 |
点评:完成脱式计算时,要注意计算过程的完整性,中间不要有太大的跳跃.

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