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21/32,1,25/24,17/18,43/54,()21/32,48/48,75/72102/108129/162分子依次是21、48、74、102、129,是公差為27的等差數列,後一項是156分母依次是32、48、72、108、162,是公比為1.5的等比數列,後一項是243156/243=52 /…
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