解方程组{4x-y=1 2x-y=-3 加减消元法.

解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 解方程组2(x-y)/3-x+y/4=-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 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=1kkkkkkkk 解方程组3(x+y)-4(x-y)=4,x+y除以2+x-y除以6=1 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/4=-1 6(x+y)-41(x-y)=12 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1 二元一次方程组 2(X+Y)-(X-Y)=3 (X+Y)-2(X-Y)=1 解方程组二元一次方程组 2(X+Y)-(X-Y)=3 (X+Y)-2(X-Y)=1 2007x+2006y=4011 2006x+2007y=40153x-y=4+y x-3y=2/y-x-1 解方程组 解方程组:2/x+3/y=0.25 ,4/x+(x+2)/y=1 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 解方程组解方程组｛y=2x-7｛x+y+z=1｛3x-z=4 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解方程组x+y/3=x-y/4 2x+3y=11 解方程组,x+y/2=3x-2y=10+6x+y/4,