1 数量关系 （全 二十四 讲） 主讲：李委明 目 录 数学运算 ................................................................................................................................................................................ .................2 第一讲：代入排除法 ................................................................................... ......................... ......................... ......................................2 第二讲：十字交叉法 ........................ ................................................ ................................................ ............ ...... ................................ 3 第三讲：数列与平均数（上）............................................................................................................................................. .......................5 第四讲：数列与平均数（下）.................................................................................................................................................................6 第五讲：工程问题 ................. .................................................................................................................................................................7 第六讲：浓度问题 ................. .................................................................................................................................................................9 第七讲：牛吃草问题 ............ ................................................................................................................................................................1 0 第八讲：边端问题 ............ ............................................................................................................................................. .......................1 2 第九讲：行程问题（上）.......................................................................................................................
