x+y=2,3x+7y=10 求x和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) 若实数X,Y同时满足3x+2y=7和2x+3y=3,求x+y/x-y |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 3x+2y=5 3y+2x=5 求x和y 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 若x+7y=y-3x，求x 已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 7x+3y=44,11x+2y=61,求x,y 已知x-y=3,求代数式7-x+y-(y-x)^2的值.