2022英语周报WHE九上新目标答案

17.(理)解析:(1)由C2(1+3mC)及正弦定理可得=2(+√sinOsing即c2=2b2(+inC),(2分)由a=b及余弦定理可得c2=a2+b2-2 abcs C=2b2(-cosC)262(1+V3sinC)=2b(1-cos C)inc=oc,故uc=√又0

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