已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²,且A+B+C=0,则C=
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已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²,且A+B+C=0,则C=
已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²,且A+B+C=0,则C=
已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²,且A+B+C=0,则C=
c=-A-B=-x^2-2y^2+z^2+4x^2-3y^2-2Z^2=3x^2-5y^2-z^2