有甲乙丙三数,甲,乙两数的平均数是100,乙,丙的平均数是八十.甲丙两数的平均数是75.,求甲,乙,丙三数的平均数?
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![有甲乙丙三数,甲,乙两数的平均数是100,乙,丙的平均数是八十.甲丙两数的平均数是75.,求甲,乙,丙三数的平均数?](/uploads/image/z/4093134-6-4.jpg?t=%E6%9C%89%E7%94%B2%E4%B9%99%E4%B8%99%E4%B8%89%E6%95%B0%2C%E7%94%B2%2C%E4%B9%99%E4%B8%A4%E6%95%B0%E7%9A%84%E5%B9%B3%E5%9D%87%E6%95%B0%E6%98%AF100%2C%E4%B9%99%2C%E4%B8%99%E7%9A%84%E5%B9%B3%E5%9D%87%E6%95%B0%E6%98%AF%E5%85%AB%E5%8D%81.%E7%94%B2%E4%B8%99%E4%B8%A4%E6%95%B0%E7%9A%84%E5%B9%B3%E5%9D%87%E6%95%B0%E6%98%AF75.%2C%E6%B1%82%E7%94%B2%2C%E4%B9%99%2C%E4%B8%99%E4%B8%89%E6%95%B0%E7%9A%84%E5%B9%B3%E5%9D%87%E6%95%B0%3F)
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