已知5|2x-3y+1|+（5x-2y-3）=0,求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) 1 已知1/X+1/Y=1/X+Y 则 Y/X+X/Y=2 已知1/X-1/Y=5,则3X+5XY-3Y/X-3XY-Y= 已知1/x-1/y=3,则5x+3y-5y/x-2xy-y的值 已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值 已知1/x+1/y=5,求2x-3y+2y/-x+2xy-y 已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为 1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值 (3x-2y)(4x-5y)-11(x+y)(x-y)+5xy,已知X=3又1/2,y=2又1/3 已知x.y满足(x-y-2≤0,x 2y-5≥0,y-2≤0 则3x+y/x+1得多少 已知x-y=-3y+5,则式子x+2y-1的值是? 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 （X+Y)^2 X^2Y+XY^2注：*/* 是分数 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 已知2x-y=-3,求代数式5(x-3y)-2(x-7y) 已知5|x+y-3|+(x-2y)²=5,求x+y的值 已知x-y=3则5(x-y)-3x+3y-2=