已知x²-4x-1=0,求代数式(2x-3)²-(x+y)(x-y)-y²求大神帮忙
已知x²-4x-1=0,求代数式(2x-3)²-(x+y)(x-y)-y²求大神帮忙
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x²-4x-1=0求代数式(2x-3)²-(x+y)(x-y)-y²的值
已知x²-4x-1=0,求代数式(2x-3)²-(x+y)(x-y)-y²的值
已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知y-2x=0,求代数式(x²-y²)(x²-xy+y²)/(x²+
已知:2x-3y=1,试求代数式:(2x²+4x-3y)+2(-x²+x-3y)-17的值
已知:x²-6xy+9y²=0,求代数式3x+5y/4x²-y²×(2x+y)的