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).......................................................................................................................