问题 解答题
(1)
b
a
a
b

(2)
b
a
b
a

(3)
2
xy
x
8

(4)
5y2
4x
8x2
15y3

(5)
b
9a2
•(-63a2b)
(6)-
5ab
18xy
9x2y3
10a2b

(7)-
18a2b2
7cd
÷
9ab3
7c2d4

(8)-
b2c
2a2
÷(
-bc2
4a
)

(9)
3a
4b
÷(-9a2b)
(10)
4x4y2
15a3
÷
-8x2y2
35a2
答案

(1)原式=1;

(2)原式=

b2
a2

(3)原式=

1
4y

(4)原式=

2x
3y

(5)原式=-7b2

(6)原式=-

xy2
4a

(7)原式=-

18a2b2
7cd
×
7c2d4
9ab3

=-

2acd3
b

(8)原式=-

b2c
2a2
×(
4a
-bc2

=

2b 
ac

(9)原式=

3a
4b
×(-
1
9a2b

=-

1
12ab2

(10)原式=

4x4y2
15a3
×
35a2
-8x2y2

=-

7x2
6a

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