联立:2x+3y=m+1(1)3x-y=2m-3(2)x+y=0(3)所以:由(1)得 m=2x+3y-1由(2)得 m=(3x-y+3)/2所以 2x+3y-1=(3x-y+3)/2把x换成-y解出:m=1/6x=-5/6y=5/6