每遇因式分解或解方程时,用“十字相乘法”解其中的一些难题往往速度快,节约时间,运算量不大,还不易出错.因此学好“十字相乘法”对学生来说很有必要.本文拟就“十字相乘法”谈点看法,顺便展示一下 Every time factorizing or solving equations, solving some problems with “Cross Multiply” is often faster, saves time, has less computational complexity, and is less error prone. So learn “Cross multiplication” It is very necessary for students. This article plans to talk about “Cross-phase multiplication” and show it by the way