3x+6y-8=0 y=?x=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5