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taotao
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修改小错误
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Diff for: math/模方程.md

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我们证明这样的解有 $d = gcd(a,n)$ 个(在模 $n$ 的意义下). 形如 $x = x_0 + (n/d)*t,t = 0,1,2,...,d-1(取遍d的剩余系)$
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* 引理1
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$ac\equiv bc(MOD\ m),且,gcd(c,m) =d,则,a\equiv b(MOD\ m/d)$
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若$ac\equiv bc(MOD\ m),且,gcd(c,m) =d,则,a\equiv b(MOD\ m/d)$
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**证:**
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