如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=

题目

如果m和n互为相反数,则m+2m+3m+4m+5m+5n+4n+3n+2n+n=

答案

既然是相反数,就是m和n两者加起来为0的,例如-1和1,-2和2就互为相反数,所以这里答案是0咯