问题 解答题
计算下面各题.(能简算的要简算.)
1
5
+
4
5
×
2
7
16×2.5×
5
2
(
1
2
-
1
5
+
5
12
)×60
答案

(1)

1
5
+
4
5
×
2
7

=

1
5
+
8
35

=

3
7

(2)16×2.5×

5
2

=40×

5
2

=100;

(3)(

1
2
-
1
5
+
5
12
)×60

=

1
2
×60-
1
5
×60+
5
12
×60

=30-12+25

=43.

单项选择题
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