化简下列各式:(1) 4ab 6 a 2 bc =______,(2) x+y x 2 - y 2 =______.
1个回答
(1)
4ab
6 a 2 bc =
2ab•2
2ab•3ac =
2
3ac ;
(2)
x+y
x 2 - y 2 =
x+y
(x+y)(x-y) =
1
x-y .
故答案为:
2
3ac ;
1
x-y .
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