目 录目 录................................................................................................................................................1第一讲 位值原理.............................................................................................................................2讲义..........................................................................................................................................2课后习题..................................................................................................................................2第二讲 数的整除特性.....................................................................................................................4讲义..........................................................................................................................................4课后习题..................................................................................................................................4第三讲 提高篇之约数与倍数（一）.............................................................................................6课上例题..................................................................................................................................6课后习题..................................................................................................................................7第四讲 提高篇之约数与倍数（二）.............................................................................................9课堂练习..................................................................................................................................9课后习题..................................................................................................................................9第五讲 质数和合数.......................................................................................................................11课上习题............................................
