完成下面的解题过程: 用公式法解下列方程: (1)2x 2 -3x-2=0. a=______,b=______,c=______. b 2 -4ac=______=______>0. x= -b± b 2 -4ac 2a =______=______, x 1 =______,x 2 =______. (2)x(2x- 6 )= 6 x-3. 整理,得______. a=______,b=______,c=______. b 2 -4ac=______=______. x= -b± b 2 -4ac 2a =______=______, x 1 =x 2 =______. (3)(x-2) 2 =x-3. 整理,得______. a=______,b=______,c=______. b 2 -4ac=______=______<0. 方程______实数根.