已知-X+3y=5,求5(X-3y)²-8(X-3y)-5的值.
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
已知|x-3|+(y-x-5)2=0,求x、y的值.
已知3/x+y=4/x+y=5/y+z,求xyz/(x+y)(y+z)(z+x)的值
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
已知3x-2y/x+y=5/3求x;y的值
已知x+y=-5,xy=3,求(x-y)²的值
已知:x-y=1,x+y=-7,求代数式3(x+y)+20(x-y)-5的值
已知x-y=5,(x+y)的平方=49,求x+y的3次方的值