已知y=x−2
已知y=x−2
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)
已知函数y=x−1x−2
已知函数y=15−2x−x
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
已知4x=9y求(1)x+y/y (2)y-x/2x
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²