A:The parents as well as their child
B:Not the parents but their child
C:Neither the child nor his parent
D:Both the parents and their child
解方程
计算:x2x+1-1x+1=____ .
关于x的一元二次方程x2-2x-3=0的根是( )
下列各组词语中,划线字的注音有错误的一项是( )
某同学患有支气管炎,不停的咳嗽,他到医院去就诊,通过对他的血液检查发现他的( )。