(2x-3y)²-4z² x²-y²-2y-1

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(2x-3y)²-4z²
=【（2x-3y)+2z][(2x-3y)-2z]
=(2x-3y+2z)(2x-3y-2z)
x²-y²-2y-1
=x²-(y²+2y+1)
=x²-(y+1)²
=(x+y+1)(x-y-1)

若3x-2y-z=0,x+4y-3z=0,求3x²+y²/4x²-y²+z (2x-3y)²-4z² x²-y²-2y-1 (x-3y+2z)²= 初一下数学 1、已知3x-4y-z=0,2x+y-8z=0,求 x²+y²-z²÷xy 已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y 已知x²+y²+z²-2x+4y-6z+14=0,求x+y-z/x+y+z的值已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值已知实数x、y、z满足(x²-6xy+10y²+4y)y²+4y+|（z-3／2）已知实数x,y,z,满足x²+4y²+根号-z²=2x+4y-2,求x+2y-z的平方已知x²+y²-6x+2y+|z+3|+10=0,求x+z-y的值若|x-2|+|3x-6y|+(3y+z)²=0,求x+y+z的值