一、填空题 t ,·.不等式组{;喜二三兰二一4z的解集是——. ’/一‘,十2·不等式一3[≯3的解集为——· ’、3.当一1z5时,z+1,z一5,(z+1)·(z一5)的符号分别是 , , 4.如果不等式组{:三要喜“+2’的解集是3zn+2,则倪的取值范围是——. 5.生产某件产品原需口分钟,现由于提 First, fill in the blank problem t, ·. inequality group {; hi two three-san 2 1 4z solution set is -. ’/ a’, 10 2 · inequality 1 3 [≯ 3’s solution set for -· ’, 3 When one is 1z5, the signs of z+1, z-5, (z+1)·(z-5) are respectively, 4. If the inequality group {: three wants hi, the solution set of +2’ is 3zn +2, then Ni’s value range is -. 5. The production of a product was originally required mouth minutes, now due to mention