(x-y-z)*( )=x²-（y-z）²

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(x-y-z)*( )=x²-（y-z）²

(x-y-z)*( )=x²-（y-z）²
(x-y-z)*( )=x²-（y-z）²

(x-y-z)*( )=x²-（y-z）²
是(x-y+z)*(x+y-z)=x²-（y-z）²