Ruby 再入门 目录 第二周：数学运算再入门 README.adoc preface/README.adoc chapter01/README.adoc chapter01/env.adoc chapter01/rvm.adoc chapter01/editor.adoc chapter01/variables.adoc chapter01/consts.adoc chapter01/functions.adoc chapter01/conditions.adoc chapter01/sugar.adoc 第二周：数学运算再入门 chapter02/math.adoc