y/3-x+1/6=3 2(x-y/2)=3(x+y/18)要过程呦!答案是x=-7,y=6

{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 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 解方程：3x+2y/4=2x+y/5=x-y+1/6要详细过程 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 2(x+y)-3(x-y) =1 6(x+y)+7(x-y)=51大神们帮帮忙