若x=100,y=99,求(x-y+4xy/x-y）（x+y-4xy/x+y）最好把它写在纸上照下来

若x=100,y=99,求(x-y+4xy/x-y）（x+y-4xy/x+y） 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 若x-y=1,求代数式x(x-y)+y(y-x)+2013的值 若x*x+y*y=x+y-1/2,求x,y的值如题 x(x-3y)=4y(x-3y),求x:y 已知：4x = 5y,求(x+y) ：y x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 2x+4y=100 x+y=49求x和y值, x+y=33,x*3+y*4=100,求x与y的值 3x+4y=100 x+y=33 x+Y=33 求x和y的值, 若x+y=4,xy=3求x分之y+y分之x