2010年macbook pro型号:分解因式:x^2+2xy-4y^2+8yz-3z^2
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x^2+2xy-4y^2+8yz-3z^2
=x^2+2xy+y^2-(5y^2-8yz+3z^2)
=(x+y)^2-(5y-3z)(y-z)
x^2+2xy-4y^2+8yz-3z^2
=x^2+2xy+y^2-(5y^2-8yz+3z^2)
=(x+y)^2-(5y-3z)(y-z)