Let N be the set of all natural numbers {0 , 1 , 2 , . . . }, and R be the set of all real numbers. wi, hi for i = 1 . . . n are some elements in N, and w0 = 0. Let N be the set of all natural numbers {0 你的当前访问异常,请进行认证后继续阅读剩余内容。 提交