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Çó½âµÝÍÆ·½³Ì a[n], ÓÃRSolve[eqn, a[n], n]  ¸ñʽÈçÏÂ
RSolve[eqn, a[n], n] solves a recurrence equation for a[n].
◼ RSolve[aa, a, ¡­ a, aa[n], a[n], ¡­ a, n] solves a system of recurrence equations.
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eqn = y[x + 2] == ay[x + 1] + y[x];
RSolve[eqn, y[x], x]
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