17,18,(*^．^*)

17,18,(*^．^*) 计算17+18+19+20+．．．．．．．．+2006一题计算题．看起来很难,但实际上很简单! 17,18 17,18, 17,18, 17,18, 17 18 17 18 17,18, 17 18 17 18 17,18, 17,18, 18,17, 17、18 17 18 17,18, 17,18,