99x99的精选

印度人是这样算的：&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp第一步：&nbsp&nbsp&nbsp先把被乘数（13）跟乘数的个位数（2）加起来&nbsp&nbsp&nbsp１３＋２＝１５&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp第二步：&nbsp&nbsp&nbsp然后把第一步的答案乘以１０(→也就是说...