因式分解:9a²(x-y)+4b²(y-x) ,(x+y)²+2(x+y)+1
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因式分解:9a²(x-y)+4b²(y-x) ,(x+y)²+2(x+y)+1
因式分解:9a²(x-y)+4b²(y-x) ,(x+y)²+2(x+y)+1
因式分解:9a²(x-y)+4b²(y-x) ,(x+y)²+2(x+y)+1
9a²(x-y)+4b²(y-x)
=9a²(x-y)-4b²(x-y)
=(x-y) (9a²-4b²)
=(x-y)(3a+2b)(3a-2b)
(x+y)²+2(x+y)+1
=(x+y+1)²