나머지 분배 법칙
PQ = (ax + b)(cx + d)
= acx^2 + bcx + adx + bd
= x(acx + bc + ad) bd
PQ % x = bd % x = (P % x)(Q % x) % x
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PQ = (ax + b)(cx + d)
= acx^2 + bcx + adx + bd
= x(acx + bc + ad) bd
PQ % x = bd % x = (P % x)(Q % x) % x