A.x²－1＜0                                                            B.x²－1＞0

C.                                                          D.＞0

(1)(5－x)(x+4)<0的解集为        ;

(2)(x+7)(2－x)>0的解集为        ;

(3)(3x+2)(2x－1)<0的解集为        ;

(4)(x－1)(5x+3)≥0的解集为        .

A.{x|0<x<2}                                                           B.{x|x>2}

C.{x|x<2}                                                               D.R

A.{x|x≥4}                                                             B.{x|x<－3或x>4}

C.{x|x<－3}                                                           D.{x|x<－3或x≥4}

A.{x|x＜b}                                                             B.{x|x＞b}

C.{x|x＞a}                                                             D.{x|x＜a}

A.                                                          B.

C.或                                      D.且