已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0

已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 已知X和Y满足3X+4Y=2,X-Y-1/7 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x,y满足约束条件：x-y+1>=0,x+y-2>=0,x 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y 已知有理数x,y满足1/2|x-y|+|y-1/2|=0 求3x+7y 已知：x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值. {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 已知x和y满足3x+4y=2,x-y 已知变量x,y满足约束条件x+2y-3=0,y-1 已知实数x,y满足5x^2-3xy+1\2y^2-2x+1\2y+1\4=0,求x,y的值 已知关于x,y的方程组{2x+3y=2a+5 2x-3y=6a-1的解满足x>0,y