若|2x-3y+1|+(5x-2y-3)^=0,则x=_,3Q

若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (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=? 化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 绝对值化简|x-y+1|-2|y-x-3|+|y-x|+5y (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 x(x-y)2-(y-x)3 若变量x,y满足约束条件{x>=-1;y>=x;3x+2y 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值