(1)
y-7=±√12=±2√3
y=7±2√3
(2)
25(2x-1)^2=16
(10x-5)^2=16
10x-5=±√16=±4
10x=5±4
x=(5±4)/10
或者说x=0.1或x=0.9
(3)2x^2-3x+1=0
(x-1)(2x-1)=0
x-1=0或2x-1=0
x=1或x=1/2