问题 解答题
化简:(1)
x2+x-6
x2+3x+9
÷(3-x)•
x2+3x+9
x-2
;(2)(-
b
a
)2÷(-
a
b2
)3•(-
a
b2
)4
答案

(1)

x2+x-6
x2+3x+9
÷(3-x)•
x2+3x+9
x-2

=

(x+3)(x-2)
x2+3x+9
×
1
3-x
×
x2+3x+9
x-2

=-

x+3
x-3

(2)(-

b
a
)2÷(-
a
b2
)3•(-
a
b2
)4

=

b2
a2
×(-
b6
a3
a4
b8

=-

1
a

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