(n-3)/(m-1)×(-2)=-1① 2(m+1)/2+(n+3)/2+5=0② 将①②整理化简为③④ -2(n-3)=-(m-1) -2n+6=-m+1 m-2n=-5③ 2(m+1)+n+3+10=0 2m+2+n+3+10=0 2m+n=-15 n=-2m-15④ 将④代入③ m-2(-2m-15)=-5 m+4m+30=-5 5m=-5-30 5m=-35 m=-7⑤ 将⑤代入④ n=14-15=-1 解得m=-7 n=-1