数学思维训练导引三年级（带答案）第一讲四则运算一................................................................................................................................................................1第二讲基本应用题.................................................................................................................................................................5第三讲和差倍问题一............................................................................................................................................................8第四讲枚举法一...................................................................................................................................................................11第五讲找规律......................................................................................................................................................................15第六讲简单加减法竖式.......................................................................................................................................................22第七讲周期问题...................................................................................................................................................................30第八讲智巧趣题一...............................................................................................................................................................35第九讲四则运算二...............................................................................................................................................................45第十讲和差倍问题二...........................................................................................................................................................48第十一讲鸡兔同笼问题一...................................................................................................................................................51第十二讲枚举法二...........
