2014年4月21日，教育部发出通知，颁布了《学生体质健康监测评价办法》等三个规范性文件，其目的是督促各地政府有关部门落实发展学校体育的职责，以学校体育基本制度建设为基础全方位促进青少年身心健康、体魄强健；要求各学校每年对所有学生进行体质健康监测，并在校内公布学生体质健康监测总体结果。 

阅读理解

　　William Jefferson Clinton(威廉·杰斐逊·克林顿)was born in a small town of America. He was born on 19th August, 1946. He was president of the USA from 1993 to 2001.

　　Wang Fei is a teacher. He was born in Shanghai and he teaches in a middle school. He is very friendly to his students. He lives in a big room with a TV, a kitchen, a bedroom and a bathroom. He is very young but very nice.

用数学归纳法证明：$1+\frac{1}{2^2}+\frac{1}{3^2}+\cdots +\frac{1}{{\left(2^n-1\right)}^2}<2-\frac{1}{2^n-1}\left(n\ge 2\right)$（n∈N^*）时第一步需要证明（　　）