用加减法解方程组:2x-3y=5 x+y/2+x-y/6=12x-3y=5x+y/2+x-y/6=1

问题描述:

用加减法解方程组:2x-3y=5 x+y/2+x-y/6=1
2x-3y=5
x+y/2+x-y/6=1

2x-3y=5①
x+y/2+x-y/6=1,则3(x+y)+x-y=6,则4x+2y=6,则2x+y=3②
①+②×3,得2x+6x=5+9,解得x=7/4
②-①,得y+3y=3-5,解得y=-1/2