各位大神，，1到9题，拜托啦。。初三的数学。。

　　1.C  2.A   3.B   4.B   5.1或0                                  6.i =

　　7.7800=9100

　　8.a≥2                                                                          闷祥         竖罩世                                            余肢                 9.x=-7或3