（1）3x²-6x=1
3(x²-2x+1)-3=1
3(x-1)²=4
(x-1)²=4/3
x-1=±√(4/3)
x=1±2√3/3
x1=1+2√3/3 x2=1-2√3/3
（2）(x+3)(x-2)=6
x²+x-6=6
x²+x-12=0
(x+4)(x-3)=0
x+4=0或x-3=0
x1=-4 x2=3