2x+2y=1 6x-6y=1

{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y)(x-y)+(x-y)^2-(6x^2y-2xy^2)/2y,其中x=-2,y=1/3 x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2 要求 解方程组：｛(X-1)(Y+1)=(X+1)(Y+1)｛X(2+Y)-6=Y(X-4) 3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解二元一次方程组{3(x+y)-(x-y)=4,x+y/2+x-y/6=1 2(x+y)-3(x-y) =1 6(x+y)+7(x-y)=51大神们帮帮忙 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51