Question

解方程2x-x的平方=2除以x要过程答案dou不对

Answer 1

2x-x^2=2/x

2x^2-x^3=2

x^3-2x^2+2=0

(x^3+1)-(2x^2-1)=0

(x+1)(x^2-x+1)-(x+1)(x-1)=0

(x+1)(x^2-x+1-x+1)=0

x+1=0或x^2+2=0

x=-1,或无解