3 m=5 3 n=7 3 n+m= 3 3n-2n=3 m=5 3 n=7 3 n+m= 3 3n-2n=
问题描述:
3 m=5 3 n=7 3 n+m= 3 3n-2n=
3 m=5
3 n=7
3 n+m=
3 3n-2n=
答
3(n+m)=12
3(3n-2n)=7
答
n + m = 5 + 7 = 12
3n - 2n = 15 - 14 = 1