1.为什么将一个整数乘2加7,把结果在乘3减21,得到的数一定是6的倍数?2.已知(3x-2)的平方加上2x-y-3的绝对值等于0,求5(2x-y)-2(7x-2y+2)+(9x-3y-1/2)的值.
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![1.为什么将一个整数乘2加7,把结果在乘3减21,得到的数一定是6的倍数?2.已知(3x-2)的平方加上2x-y-3的绝对值等于0,求5(2x-y)-2(7x-2y+2)+(9x-3y-1/2)的值.](/uploads/image/z/1721453-5-3.jpg?t=1.%E4%B8%BA%E4%BB%80%E4%B9%88%E5%B0%86%E4%B8%80%E4%B8%AA%E6%95%B4%E6%95%B0%E4%B9%982%E5%8A%A07%2C%E6%8A%8A%E7%BB%93%E6%9E%9C%E5%9C%A8%E4%B9%983%E5%87%8F21%2C%E5%BE%97%E5%88%B0%E7%9A%84%E6%95%B0%E4%B8%80%E5%AE%9A%E6%98%AF6%E7%9A%84%E5%80%8D%E6%95%B0%3F2.%E5%B7%B2%E7%9F%A5%EF%BC%883x-2%EF%BC%89%E7%9A%84%E5%B9%B3%E6%96%B9%E5%8A%A0%E4%B8%8A2x-y-3%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%AD%89%E4%BA%8E0%2C%E6%B1%825%EF%BC%882x-y%EF%BC%89-2%EF%BC%887x-2y%2B2%29%2B%289x-3y-1%2F2%29%E7%9A%84%E5%80%BC.)
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