已知x+[y]=201.1,{x}+y=20.11,x+y=
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)
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
已知:4x = 5y,求(x+y) :y
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
1.已知1/x+1/y=-1/x+y,则y/x+x/y=?
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知4x=9y求(1)x+y/y (2)y-x/2x
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?