20届初二五羊杯1.已知a,b,c都是整数,并且a+b+c被7除余1;a+2b+4c被7除余2;2a-b+2c被7除余3;那么a+b-c被7除所得的余数为?A=1;B=2;C=3;D=4 2.A、B、C、D、E五个人都拥有一些藏书,并且五人的藏书数量A
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![20届初二五羊杯1.已知a,b,c都是整数,并且a+b+c被7除余1;a+2b+4c被7除余2;2a-b+2c被7除余3;那么a+b-c被7除所得的余数为?A=1;B=2;C=3;D=4 2.A、B、C、D、E五个人都拥有一些藏书,并且五人的藏书数量A](/uploads/image/z/4084619-59-9.jpg?t=20%E5%B1%8A%E5%88%9D%E4%BA%8C%E4%BA%94%E7%BE%8A%E6%9D%AF1.%E5%B7%B2%E7%9F%A5a%2Cb%2Cc%E9%83%BD%E6%98%AF%E6%95%B4%E6%95%B0%2C%E5%B9%B6%E4%B8%94a%2Bb%2Bc%E8%A2%AB7%E9%99%A4%E4%BD%991%EF%BC%9Ba%2B2b%2B4c%E8%A2%AB7%E9%99%A4%E4%BD%992%EF%BC%9B2a-b%2B2c%E8%A2%AB7%E9%99%A4%E4%BD%993%EF%BC%9B%E9%82%A3%E4%B9%88a%2Bb-c%E8%A2%AB7%E9%99%A4%E6%89%80%E5%BE%97%E7%9A%84%E4%BD%99%E6%95%B0%E4%B8%BA%3FA%3D1%EF%BC%9BB%3D2%EF%BC%9BC%3D3%EF%BC%9BD%3D4+2.A%E3%80%81B%E3%80%81C%E3%80%81D%E3%80%81E%E4%BA%94%E4%B8%AA%E4%BA%BA%E9%83%BD%E6%8B%A5%E6%9C%89%E4%B8%80%E4%BA%9B%E8%97%8F%E4%B9%A6%2C%E5%B9%B6%E4%B8%94%E4%BA%94%E4%BA%BA%E7%9A%84%E8%97%8F%E4%B9%A6%E6%95%B0%E9%87%8FA)
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