\u4e0b\u5217\u5404\u9898\u80fd\u7b80\u7b97\u7684\u8981\u7b80\u7b97:15\u4e5899\u52a015\uff1f

15*99+15
=15*\uff0899+1\uff09
=15*100
=1500

\u8fd9\u4e2a\u7b97\u5f0f\u53ef\u4ee5\u5229\u7528\u4e58\u6cd5\u5206\u914d\u5f8b\u6765\u8ba1\u7b97\uff0c\u7b49\u4e8e13\u4e58\u4ee5\u62ec\u53f799+1\u62ec\u53f7\u7b49\u4e8e13\u00d7100=1300