Question

（m+1）+（2n-1）=5 （n+2）+（2m）=3 帮我解一下这个方程.

Answer 1

（m+1）+（2n-1）=5 (1)

（n+2）+（2m）=3 (2)

由(2) :n+2+2m=3

n+2m =3-2

n+2m =1

n =1-2m (3)

(3)代入(1) m+1 +2n-1=5

m+2n =5

m+2(1-2m)=5

m+2-4m =5

-3m =5-2

-3m =3

m=-1

n=1-2m

n=1-2(-1)

n=1+2

n=3

m=-1 ,n=3