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指数衰减： A(t) = A_0 * 0.5^(t/T) 。对 A_0 = 100 和 ， 是多少？ 是多少？
指数衰减： A(t) = A_0 * 0.5^(t/T) 。对 A_0 = 100 和 ， 是多少？ 是多少？
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