一、忽视幕指数“1”出错 例1计算:x·尹.了 错解:原式一尹+‘~尹 剖析:这是由于忽视了第一个因式中x 的指数1而造成的错误. 正解:原式一尸斗2+‘一了 二、同底数幕的乘法与合并同类项相混 淆 例2计算:及.护 错解:原式一(l+1)护一2护 剖析:误把系数相加,字母的指数不变, 与合并 First, ignore the screen index “1” error Example 1 calculation: x Yin. The wrong solution: the original formula Yin + ’~ Yin analysis: This is due to ignore the first factor in the x index 1 caused by the error Positive solution: the original formula of a corpse 2+ ’one by one, with the same number of multiplication and merger of the same type of item is confused with Example 2 calculations: and protection of the wrong solution: the original one (l +1) care a 2 protection analysis: Adding coefficients by mistake, the index of letters unchanged, and merging