已知a,b,c是三个非负数,并且满足3a+2b+c=5,2a+b-3c=1,设M=3a+b-7c,记M的最大值为x最小值为y,求xy
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![已知a,b,c是三个非负数,并且满足3a+2b+c=5,2a+b-3c=1,设M=3a+b-7c,记M的最大值为x最小值为y,求xy](/uploads/image/z/2770053-69-3.jpg?t=%E5%B7%B2%E7%9F%A5a%2Cb%2Cc%E6%98%AF%E4%B8%89%E4%B8%AA%E9%9D%9E%E8%B4%9F%E6%95%B0%2C%E5%B9%B6%E4%B8%94%E6%BB%A1%E8%B6%B33a%2B2b%2Bc%3D5%2C2a%2Bb-3c%3D1%2C%E8%AE%BEM%3D3a%2Bb-7c%2C%E8%AE%B0M%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BAx%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BAy%2C%E6%B1%82xy)
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