2x+2y-x+y=3;x+y-2x+2y=1 方程组的解

如果方程组3x+y=k x+3y=2的解x,y 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) 数学书解方程组{2(x+y)-(x-y)=3,（x+y)-2(x-y)=1 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5) 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 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解二元一次方程组{3(x+y)-4(x-y)=4,x+y/2+x-y/6=1