{10x+9y=493 x+y=52

x+x+x+y=52 y+y+y+x=36求x 解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 解方程组：2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 解方程组 2x+y(y-2x)=9 (x+y)(x+y-3)=10 ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 已知/x/+x+y=10,/y/+x-y=12.求x+y的值 已知4x=9y求(1)x+y/y (2)y-x/2x 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 解下X+X+X+Y=52 Y+Y+Y+X＝36 求X＝? Y＝?还要过程 X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) 已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值? x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值