x+y=138,3x+5y=540 求x y的值
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知:x-y=1,x+y=-7,求代数式3(x+y)+20(x-y)-5的值
若x+y=-5,xy=3,求x/y+y/x的值
已知3x-2y/x+y=5/3求x;y的值
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
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值