问题 解答题
化简
0.45×7×0.5
3×0.5×0.7
3
8
+
1
4
1+2
2
5
×
5
8
答案

(1)

0.45×7×0.5
3×0.5×0.7
=1.5;

(2)

3
8
+
1
4
1+2
2
5
×
5
8

=

5
8
1+
12
5
×
5
8

=

5
8
1+
3
2

=

5
8
5
2

=

5
8
×
2
5

=

1
4

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