Question

3x的平方-x-15.6=0

Answer 1

3x的平方-x-15.6=0

3x^2-x=15.6

x^2-x/3=5.2

(x-1/6)^2=5.2+1/36=5+1/5+1/36=941/180

x-1/6=±√（941/180)

x1=1/6+√(941/180) x2=1/6-√(941/180) .