问题 解答题
计算:
(1)
18
2

(2)
72
6

(3)
b
5
÷
b
20a2

(4)
6a2
÷
24a
答案

(1)

18
2
=
9
=3;

(2)

72
6
=
72
6
=
12
=2
3

(3)原式=

b
5
×
20a2
b
=
4a2
=2|a|;

(4)原式=

a
4
=
a
2

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