2+22+222+2222+省略号+222222222
问题描述:
2+22+222+2222+省略号+222222222
答
= 2 (1+11+.+111111111) = 2 x 123456789 = 246913578
2+22+222+2222+省略号+222222222
= 2 (1+11+.+111111111) = 2 x 123456789 = 246913578