A maths problem is a maths calculation that needs to be solved. The boy says that his maths book is unhappy because it has a lot of problems (which could also mean worries or preoccupations).
男孩問：為什數學課本這麼不快樂呢？它有很多問題（problems）呢！
網址：www.britishcouncil.hk/english
■漫畫&說明︰英國文化協會
逢星期五見報