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3【答案】一cosx2新教材版X·39·【解析】若fx)=cos,则f'(x)=-sinx,f(x)=-cosz,当x∈(0，受)时，e0sx>0,f(x)<0.又cosA>0osB>0,easC>0,所以fA+8+C)≥fA+fB)+fC,即oms音≥osA+osB+cosC33所以=3cos A+cos B+cos C<3cos3=2
54.Hard difficult journeys for schoolchildren55.In2001.56.Because they don't want to go to work or get married at a young age.Because theythink going to school means a better future.To have a better future./..57.By riding his donkey.58.Forty minutes.59.By bike.By bus./..Because it's not only good for my health but also good for the environment./Because it's convenient./..
