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求解答，谢谢！！！！

2025-03-26 15:25:49
推荐回答（1个）
回答1：

tanC=tan(Pi-(A+B))=-tan(A+B)=-(tanA+tanB)/(1-tanA*tanB)
tanA+tanB=-b/a=-6
tanA*tanB=c/a=7
所以tanC=-(-6)/(1-7)=-1

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