甲数和乙数的比是3:5,乙数和丙数的比是4:7.已知甲数是12,求甲乙丙三个数的和.算式和算式过程还有答案都要写!
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![甲数和乙数的比是3:5,乙数和丙数的比是4:7.已知甲数是12,求甲乙丙三个数的和.算式和算式过程还有答案都要写!](/uploads/image/z/546222-30-2.jpg?t=%E7%94%B2%E6%95%B0%E5%92%8C%E4%B9%99%E6%95%B0%E7%9A%84%E6%AF%94%E6%98%AF3%3A5%2C%E4%B9%99%E6%95%B0%E5%92%8C%E4%B8%99%E6%95%B0%E7%9A%84%E6%AF%94%E6%98%AF4%3A7.%E5%B7%B2%E7%9F%A5%E7%94%B2%E6%95%B0%E6%98%AF12%2C%E6%B1%82%E7%94%B2%E4%B9%99%E4%B8%99%E4%B8%89%E4%B8%AA%E6%95%B0%E7%9A%84%E5%92%8C.%E7%AE%97%E5%BC%8F%E5%92%8C%E7%AE%97%E5%BC%8F%E8%BF%87%E7%A8%8B%E8%BF%98%E6%9C%89%E7%AD%94%E6%A1%88%E9%83%BD%E8%A6%81%E5%86%99%21)
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