1.根据已知条件求三角形形状(1).在△ABC中sinA=2sinBcosC,sin²A=sin²B+sin²C,判断三角形的形状(2).b²-c²=2a²,sin²A=sinBsinC(3).A+C=2B,b²=ac2.△ABC中,c=2,C=60°求(1).若S=√3,
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![1.根据已知条件求三角形形状(1).在△ABC中sinA=2sinBcosC,sin²A=sin²B+sin²C,判断三角形的形状(2).b²-c²=2a²,sin²A=sinBsinC(3).A+C=2B,b²=ac2.△ABC中,c=2,C=60°求(1).若S=√3,](/uploads/image/z/531563-59-3.jpg?t=1.%E6%A0%B9%E6%8D%AE%E5%B7%B2%E7%9F%A5%E6%9D%A1%E4%BB%B6%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2%E5%BD%A2%E7%8A%B6%EF%BC%881%EF%BC%89.%E5%9C%A8%E2%96%B3ABC%E4%B8%ADsinA%3D2sinBcosC%2Csin%26sup2%3BA%3Dsin%26sup2%3BB%2Bsin%26sup2%3BC%2C%E5%88%A4%E6%96%AD%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E5%BD%A2%E7%8A%B6%EF%BC%882%EF%BC%89.b%26sup2%3B-c%26sup2%3B%3D2a%26sup2%3B%2Csin%26sup2%3BA%3DsinBsinC%EF%BC%883%EF%BC%89.A%2BC%3D2B%2Cb%26sup2%3B%3Dac2.%E2%96%B3ABC%E4%B8%AD%2Cc%3D2%2CC%3D60%C2%B0%E6%B1%82%EF%BC%881%EF%BC%89.%E8%8B%A5S%3D%E2%88%9A3%2C)
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