perpendicular, 垂直, irrational number, 无理数, elimination by addition and subtraction, 加减消元法, alternate angle, 内错角, vertex, 顶点, constant term, 常数项, less than or equal to, 小于等于, greater than or equal to, 大于等于, Analyze data, 分析数据, Sample survey, 抽样调查

Leaderboard

Visual style

Options

Switch template

Continue editing: ?