问题 解答题
能简算的要简算
40%×
2
3
+60%×
2
3
20%×
5
4
-20%×
1
4
1
4
×35%+0.25×65%
75%×125-75%×25
2
3
+
3
5
)×45
15×40%+85×40%
答案

(1)40%×

2
3
+60%×
2
3

=(40%+60%)×

2
3

=1×

2
3

=

2
3

(2)20%×

5
4
-20%×
1
4

=20%×(

5
4
-
1
4
),

=20%×1,

=0.2;

(3)

1
4
×35%+0.25×65%,

=0.25×(35%+65%),

=0.25×1,

=0.25;

(4)75%×125-75%×25,

=75%×(125-25),

=0.75×100,

=75;

(5)(

2
3
+
3
5
)×45,

=

2
3
×45+
3
5
×45,

=30+27,

=57;

(6)15×40%+85×40%,

=(15+85)×0.4,

=100×0.4,

=40.

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