(m+1)+(2n-1)=5 (n+2)+(2m)=3 帮我解一下这个方程.
问题描述:
(m+1)+(2n-1)=5 (n+2)+(2m)=3 帮我解一下这个方程.
答
(m+1)+(2n-1)=5 (1)(n+2)+(2m)=3 (2)由(2) :n+2+2m=3n+2m =3-2n+2m =1n =1-2m (3)(3)代入(1) m+1 +2n-1=5m+2n =5m+2(1-2m)=5m+2-4m =5-3m =5-2-3m =3m=-1n=1-2mn=1-2(-1)n=1+2n=3m=-1 ,n=3