题目

阅读理解 Long ago，poems were recited out loud instead of being written down. Back when the Greeks first started the Olympics, they held poetry contests as well as athletic competitions. Now，poetry competitions have been revived (恢复). This year 120,000 high school students competed in the first Poetry Out Loud national recitation contest，performing poems from memory for $100,000 in prizes. The first competitions were held in classrooms. The winners went on to school－wide contests, and then they competed in city and state competitions. Finally, the 50 state champions，along with已知函数f（x）=|2x+1|，x＜1log2(x-m)，x＞1，若f（x1）=f（x2）=f（x3）（x1、x2、x3互不相等），且x1+x2+x3的取值范围为（1，8），则实数m的值为 ．