一、含字母系数的分式方程化为整式方程后,字母取值使整式方程无解,因此原分式方程也无解.例1 a取何值时,关于x的分式方程x+1/x=a无解?解方程两边同乘以x化为整式方程,得x+1=ax,即(a一1)x=1.当a≠1时,x=1/a-1≠0,是原方程的解.当a=1时,变形后的整式方程无解,所以 First, with the letter coefficient of the fractional equation into an integral equation, the letter value so that the integral equation no solution, so the original fractional equation has no solution. Example 1 a take any value, on the x fractional equation x +1 / x = a no solution? Solving the equation both sides by the same x into the integral equation, we have x +1 = ax, (a a) x = 1. When a ≠ 1, x = 1 / a -1 0, is the solution of the original equation.When a = 1, the deformed integral equation has no solution, so