规定:6※2 = 6+66 = 72,2※3 = 2+22+222 = 246,1※4 = 1+11+111+1111 = 1234,那么:7※5是多少?

问题描述:

规定:6※2 = 6+66 = 72,2※3 = 2+22+222 = 246,1※4 = 1+11+111+1111 = 1234,那么:7※5是多少?

7※5=
7+77+777+7777+77777 = 86 415