论文部分内容阅读
人教版《数学》八年级(下)第27页关于分式方程增根产生原因这样写到:“为什么(100)/20+v=(60)/20-v①去分母所得整式方程的解就是①的解,而1/x-5=(10)/x~2-25②去分母后所得整式方程的解却不是②的解呢?解分式方程去分母时,方程两边要同乘一个含未知数的式子(最简公分母).方程①两边同乘(20+v)(20-v),得到整式方程并进而得到它的解
PEP (eighth grade) (next) Page 27 On the reasons for the root cause of the fractional equation is written as: ”Why (100) / 20 + v = (60) / 20-v ① The integral equation to the denominator Solution is ① solution, and 1 / x-5 = (10) / x ~ 2-25 ② to the denominator after the solution of the integral equation is not ② solution? Solution Fractional equation to the denominator, the equation to the same multiplication by An equation with the unknowns (the simplest denominator). Equation (1) Both sides of the equation (20 + v) (20-v), get the integral equation and then get its solution