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运算与逆运算,变換与逆变換,函数与逆函数,命題与逆命題(为說話方便起見,下面統称正过程与逆过程)几乎充滿了中学数学的整个篇章。經驗告訴我們:学生对逆过程的掌握总比正过程困难,小学生觉得减法比加法难,除法比乘法难;中学生觉得因式分解此多項式乘法难,开方比乘方难,方根此幂难,对数运算此指数运算难,反三角函数比三角函数难,就是到了大学又何尝不是感到积
Computation and inverse computing, transformation and inverse transformation, function and inverse function, proposition and inverse proposition (for the sake of convenience, the following generally referred to as the positive process and the inverse process) is almost full of high school mathematics throughout the chapter. Experience tells us: students master the reverse process than the positive process is difficult, the pupils think subtraction than the addition of law, the division than the multiplication difficult; high school students think factorial polynomial multiplication difficult, , Logarithm operation of this index is difficult, the anti-trigonometric function than the trigonometric function is difficult, it is to the university and then not feel the plot