3x²+4xy-y²因式分解(过程)

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3x²+4xy-y²因式分解(过程)
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3x²+4xy-y²因式分解(过程)
3x²+4xy-y²因式分解(过程)

3x²+4xy-y²因式分解(过程)
这个真分解不了,要是+y方可以
(3x+y)*(x+y)

3x²+2xy-y²
=x²+2xy+y²+2x²-2y²
=(x+y)²+2(x²-y²)
=(x+y)²+2(x+y)(x-y)
=(x+y)(x+y+2x-2y)
=(x+y)(3x-y)答案不对呀,,,,??据说答案很长一串,仁兄麻烦再想想我是把你题目...

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3x²+2xy-y²
=x²+2xy+y²+2x²-2y²
=(x+y)²+2(x²-y²)
=(x+y)²+2(x+y)(x-y)
=(x+y)(x+y+2x-2y)
=(x+y)(3x-y)

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