题目内容
请直接写出下列一元二次方程的解:
(1) _________________; (2)_________________ ;
(3) ________________; (4) ________________.
请直接写出下列一元二次方程的解:(1) _________________ ; (2)_________________ ; (3) ________________ ; (4) ________________.
(1) _________________ ; (2)_________________ ;
(3) ________________ ; (4) ________________.