若m,n满足m+2n=8,2m+n=7,则m+n=

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若m,n满足m+2n=8,2m+n=7,则m+n=若m,n满足m+2n=8,2m+n=7,则m+n=若m,n满足m+2n=8,2m+n=7,则m+n=m+2n=8,2m+n=7两式相加3m+3n=15

若m,n满足m+2n=8,2m+n=7,则m+n=
若m,n满足m+2n=8,2m+n=7,则m+n=

若m,n满足m+2n=8,2m+n=7,则m+n=
m+2n=8,
2m+n=7
两式相加
3m+3n=15
3(m+n)=15
m+n=5

两式。左面的左面相加,右面的右面相加。得出
3m+3n=7+8
3(m+n)=15
m+n=5