First, ask for the case that both books are Chinese books, and then the rest is the case that one of the two books is a math book or both books are math books. When both books are in Chinese, C (subscript 10) (superscript 2)/C (subscript 12) (superscript 2)= 15/22.

The probability of taking out two books at random and a math book is 1-C (subscript 10) (superscript 2)/C (subscript 12) (superscript 2)=7/22.