问题 解答题
计算:
8
5
×
25
24

2.25×1.8+17.5×0.18;
30×(
2
5
+
1
6
-
4
15
).
答案

(1)2÷

8
5
×
25
24

=2×

5
8
×
25
24

=

125
96

(2)2.25×1.8+17.5×0.18

=2.25×1.8+1.75×1.8

=(2.25+1.75)×1.8

=4×1.8

=7.2

(3)30×(

2
5
+
1
6
-
4
15

=30×

2
5
+30×
1
6
-30×
4
15

=12+5-8

=9

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