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17.(本小题满分12分解:(1)由题意√3(a- bcos)= csin B得√3(sinA- sin B cos C= sin C sin B,即√3[sin(B C)- sin Bcos C]= sin C sin B化简得tanB=3,0

第二节书面表达(满分25分)Dear tomHow are you? From your letter I get to know Su Bingtian charms you. Yes, I couldnt agree more with youthat he is an excellent athlete worth admiring. And indeed, his performance in Tokyo Olympics is extraordinaryAs a matter of fact, besides Su bingtian, there are many other outstanding athletes in China too, amongwhom I admire Quan Hongchan most. She was born into a poor family. However, with her talent and moreimportantly, her persistent efforts, she changes her life. Her story really inspires me to pursue my own dreambravely.Su Bingtian and Quan Hongchan set a good example for us. We both should hold on to our dream, right?Best wishes!YoursLi Hua