一道对于我来说算不出来的数学题,谁能帮我算一下?已知a=20/1x+20,b=20/1x+19,c=20/1x+21,求a的平方+b的平方+c的平方减ab减bc减ac的值,
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![一道对于我来说算不出来的数学题,谁能帮我算一下?已知a=20/1x+20,b=20/1x+19,c=20/1x+21,求a的平方+b的平方+c的平方减ab减bc减ac的值,](/uploads/image/z/2613795-51-5.jpg?t=%E4%B8%80%E9%81%93%E5%AF%B9%E4%BA%8E%E6%88%91%E6%9D%A5%E8%AF%B4%E7%AE%97%E4%B8%8D%E5%87%BA%E6%9D%A5%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E8%B0%81%E8%83%BD%E5%B8%AE%E6%88%91%E7%AE%97%E4%B8%80%E4%B8%8B%3F%E5%B7%B2%E7%9F%A5a%3D20%2F1x%2B20%2Cb%3D20%2F1x%2B19%2Cc%3D20%2F1x%2B21%2C%E6%B1%82a%E7%9A%84%E5%B9%B3%E6%96%B9%2Bb%E7%9A%84%E5%B9%B3%E6%96%B9%2Bc%E7%9A%84%E5%B9%B3%E6%96%B9%E5%87%8Fab%E5%87%8Fbc%E5%87%8Fac%E7%9A%84%E5%80%BC%2C)
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