1.若(z-x)2-4(x-y)(y-z)=0.求证:x,y,z成等差数列..ps:这里的2是平方..2.在三角形ABC中,若BC=a,CA=b,AB=c,且sin2A,sin2B,sin2C成等差数列,求证:cosA/a,cosB/b,cosC/c也成等差数列..ps:这里的2也是平方..3.已知一等差数
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![1.若(z-x)2-4(x-y)(y-z)=0.求证:x,y,z成等差数列..ps:这里的2是平方..2.在三角形ABC中,若BC=a,CA=b,AB=c,且sin2A,sin2B,sin2C成等差数列,求证:cosA/a,cosB/b,cosC/c也成等差数列..ps:这里的2也是平方..3.已知一等差数](/uploads/image/z/693346-58-6.jpg?t=1.%E8%8B%A5%28z-x%292-4%28x-y%29%28y-z%29%3D0.%E6%B1%82%E8%AF%81%3Ax%2Cy%2Cz%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97..ps%3A%E8%BF%99%E9%87%8C%E7%9A%842%E6%98%AF%E5%B9%B3%E6%96%B9..2.%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%8B%A5BC%3Da%2CCA%3Db%2CAB%3Dc%2C%E4%B8%94sin2A%2Csin2B%2Csin2C%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82%E8%AF%81%3AcosA%2Fa%2CcosB%2Fb%2CcosC%2Fc%E4%B9%9F%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97..ps%3A%E8%BF%99%E9%87%8C%E7%9A%842%E4%B9%9F%E6%98%AF%E5%B9%B3%E6%96%B9..3.%E5%B7%B2%E7%9F%A5%E4%B8%80%E7%AD%89%E5%B7%AE%E6%95%B0)
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