i have no interest in math at all.
有关interest的用法也帮你列出了，希望你可以举一反三
interest的用法
interest vt. 使……感兴趣 n. 兴趣，爱好 [U] 利息；利润 He has a great interest in politics. 他对政治极感兴趣。/ a broad interest 广泛的利益 / a common interest 共同的利益 / a strong interest 极强的兴趣
▲构词：① interesting 令人感兴趣的(事物) ② interested (某人对某事)有兴趣的
▲搭配：① interest sb in sth 使某人注意，关心或参入某事；使某人对某事感兴趣 ② be interested in 对……感兴趣(关心) ③have an interest in sth. / in doing sth. 对某方面有兴趣 (关心)；在……中有股份、权益等 ④ hold one's interest 吸引住某人的兴趣 ⑤ in the interest(s) of 为……利益；为……起见；对……有利 ⑥ lose interest in 对……不再感兴趣 ⑦ show / take (an) interest in / in doing sth. 对……表示关心(有兴趣) ⑧ have / take / feel no interest in 对……不 (不太) 感兴趣 ⑨ with interest 有兴趣地，津津有味地 ⑩develop / find / feel interest in sth. / in doing sth. 在某方面培养／有兴趣 ⑪ lose interest in sth. / in doing sth. 对某方面失去兴趣
有时interest可与不定冠词连用。He developed an interest in science.
另外：interest作“爱好”解时，是可数名词。 His interests include reading and tennis.
参考资料：有关interest的用法，参考天涯翻译的讲解。