任何老师上一堂数学课,总是事先认真备课,认真教导,希望学生做起习题来全部都对,但结果总会产生或多或少的错误,这种情况并不是少数。错误是常发病,又是多发病,见惯了往往不以为怪,然而,错误不是小事而是大事,从小就必须认真对待。有经验的老师都知道学生做式题计算时,小错小误经常发生,大错误也不少,有些特殊的 Any teacher in a math class, always carefully prepare lessons in advance, conscientiously teach, I hope students do exercises to all right, but the result will always be more or less wrong, this is not a minority. It is not uncommon to find that mistakes are common and frequently occurring. However, mistakes are not small but important, and they must be taken seriously as a child. Experienced teachers all know that when students do the formula calculation, small mistakes often occur, there are many mistakes, some special