x+(11-3)*y=17 x+(23-3)*y=35 求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) 已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 若x+7y=y-3x，求x |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y 3x-2y=15 3y-2x=11 求x+y 7x+3y=44,11x+2y=61,求x,y (3x+2y)+(5x-y)i=17-2i.求x与y 已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.（过程完 已知x、y均为实数,且满足xy+x+y=17,x^2y+y^2x=66,求x^4+x^3y+x^2*y^2+y^3x+y 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27