已知a、b、c是△ABC的三边,且(2b)×(2b)=4×(a+c)×(a-c),且有5a-3c=0求sinA+sinB 已知a、b、c是△ABC的三边,且(2b)×(2b)=4×(a+c)×(c-a),且有5a-3c=0求sinA.+sinB
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![已知a、b、c是△ABC的三边,且(2b)×(2b)=4×(a+c)×(a-c),且有5a-3c=0求sinA+sinB 已知a、b、c是△ABC的三边,且(2b)×(2b)=4×(a+c)×(c-a),且有5a-3c=0求sinA.+sinB](/uploads/image/z/2537603-35-3.jpg?t=%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9%2C%E4%B8%94%282b%29%C3%97%282b%29%3D4%C3%97%28a%2Bc%29%C3%97%28a-c%29%2C%E4%B8%94%E6%9C%895a-3c%3D0%E6%B1%82sinA%2BsinB+%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%89%E8%BE%B9%EF%BC%8C%E4%B8%94%EF%BC%882b%EF%BC%89%C3%97%EF%BC%882b%EF%BC%89%EF%BC%9D4%C3%97%EF%BC%88a%2Bc%EF%BC%89%C3%97%EF%BC%88c-a%EF%BC%89%EF%BC%8C%E4%B8%94%E6%9C%895a-3c%3D0%E6%B1%82sinA.%2BsinB)
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