分解因式(a+b)(a+b-6)+a 4x^2 y^2-(x^2+y^2)^2 x^2-2xy+y^2-9
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(a+b)(a+b-6)+9 改了一下
=(a+b)²-6(a+b)+9
=(a+b-3)²
4x²y²-(x²+y²)²
=(2xy)²-(x²+y²)²
=(2xy-x²-y²)(2xy+x²+y²)
=-(x²-2xy+y²)(x²+2xy+y²)
=-(x-y)²(x+y)²
x²-2xy+y²-9
=(x-y)²-9
=(x-y+3)(x-y-3)
=(a+b)²-6(a+b)+9
=(a+b-3)²
4x²y²-(x²+y²)²
=(2xy)²-(x²+y²)²
=(2xy-x²-y²)(2xy+x²+y²)
=-(x²-2xy+y²)(x²+2xy+y²)
=-(x-y)²(x+y)²
x²-2xy+y²-9
=(x-y)²-9
=(x-y+3)(x-y-3)
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