求.y=－2x .y=－2x+5 ,y=3x y=3x+5 y=－3x y=－3x+五分之二 的一次函数图像坐标 .给出他们 的坐标就好.

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求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｜=3,｜y｜=2,且｜x－y｜=y－x,求x+y的值. y=2x*arctan(y/x),求y‘’ 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. 已知:3x-5y=0,求x/y,x-y/y,x-y/x x+2y=2x+y+1=7x-y 求：2x-y? 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y x^2+y^2=15,x+y=7,x＞y,求x-y 求y''+2y'+y=e^-x/x的通解y''+2y'+y=（e^-x）/x f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)!