题目内容

能简算的用简便方法计算.
2
5
-
2
5
÷2)×
5
3
15
16
-(
7
12
+
1
6
)×
1
2
204÷
1
91
+204×9
1
2
×3.2+5.6×0.5+1.2×50%
[
5
3
-(
2
5
+
3
4
)]÷
31
4
99×
97
98
(1)(
2
5
-
2
5
÷2)×
5
3

=(
2
5
-
1
5
)×
5
3

=
1
5
×
5
3

=
1
3


(2)
15
16
-(
7
12
+
1
6
)×
1
2

=
15
16
-
3
4
×
1
2

=
15
16
-
3
8

=
9
16


(3)204÷
1
91
+204×9
=204×91+204×9
=204×(91+9)
=204×100
=20400;

(4)
1
2
×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5
=0.5×(3.2+5.6+1.2)
=0.5×10
=5;

(5)[
5
3
-(
2
5
+
3
4
)]÷
31
4

=[
5
3
-
23
20
31
4

=
31
60
÷
31
4

=
1
15


(6)99×
97
98

=(98+1)×
97
98

=98×
97
98
+1×
97
98

=97+
97
98

=97
97
98
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