(1)9mn236n3=m() (2)x2+2xy+y2x2-y2=x+y().

(1)9mn236n3=m() (2)x2+2xy+y2x2-y2=x+y().

题型:填空题难度:一般来源:不详
(1)
9mn2
36n3
=
m
()

(2)
x2+2xy+y2
x2-y2
=
x+y
()
答案
(1)
9mn2
36n3
=
m
4n


(2)
x2+2xy+y2
x2-y2

=
(x+y)2
(x+y)(x-y)

=
x+y
x-y

故答案为:4n,x-y.
举一反三
ab≠0,下列各式中,变形正确的是(  )
A.
a2
b2
=
a
b
B.
a-ab
ab
=
1-b
b
C.
a-b
a2-b2
=
1
a-b
D.
b
a
=
b+c
a+c
题型:单选题难度:一般| 查看答案
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