Question

用配方法解方程x的平方减x减1等于0,变形后为

Answer 1

x²-x-1=0

x²-x=1

x²-x+1/4=1+1/4

(x-1/2)²=5/4

x-1/2=±根5/2

x=1/2±根5/2

x1=1/2+根5/2 x2=1/2-根5/2