Question

方程【x方-1分之2(x+1)】+1=0,有增根,增跟为

Answer 1

答：

【x方-1分之2(x+1)】+1=0

2(x+1)/(x^2-1)+1=0有增根,x^2-1≠0,x≠-1并且x≠1

2(x+1)/(x^2-1)=-1

2x+2=1-x^2

x^2+2x+1=0

x=-1

增根为x=-1