已知3x-5y=0,求x/x+y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知|3-y|+|x+y|=0,求x+yxy
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-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知:4x = 5y,求(x+y) :y
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知(x+2)^2+|x+y+5|=0,求3x^2y+{-2X^2y-[-2xy+(x^2y-4x^2)]-xy}