题目内容

计算,能简算的要简算.
3
1
4
×15
2
3
-1.25×15
2
3
2
7
×40%+
5
7
×40%
1
50
+(1-
2
5
3
20
[
3
4
-(
7
16
-0.25)]×
17
9
(1)3
1
4
×15
2
3
-1.25×15
2
3

=(3
1
4
-1.25)×15
2
3

=2×15
2
3

=31
1
3


(2)
2
7
×40%+
5
7
×40%,
=(
2
7
+
5
7
)×40%,
=1×0.4,
=0.4;

(3)
1
50
+(1-
2
5
÷
3
20

=
1
50
+
3
5
÷
3
20

=
1
50
+4,
=4
1
50


(4)[
3
4
-(
7
16
-0.25
)]×
17
9

=[
3
4
-
3
16
17
9

=
9
16
×
17
9

=
17
16
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