方程组4x+5y=7 ,y+1=6-y-6x

y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 解方程组4x+5y=3.5,x-1=1.8-x-6y 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 要求 解方程组：｛(X-1)(Y+1)=(X+1)(Y+1)｛X(2+Y)-6=Y(X-4) 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1 解二元一次方程组{3(x+y)-4(x-y)=4,x+y/2+x-y/6=1 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1 解方程组{4/x+y+6/x-y=3, 9/x-y-1/x+y=1