1.(x+2)(x+3)-12 2.(x²-y²+z²)²-4x²z²

问题描述:

1.(x+2)(x+3)-12 2.(x²-y²+z²)²-4x²z²

您好:
(x+2)(x+3)-12
=x²+5x+6-12
=x²+5x-6
=(x+6)(x-1)
(x²-y²+z²)²-4x²z²
=(x²-y²+z²+2xz)(x²-y²-2xz)
=[(x+z)²-y²][(x-z)²-y²]
=(x+z+y)(x+z-y)(x-z+y)(x-z-y)


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