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數學題PLZ

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(1+y)^20=1.47 求y 400(1-R)^24=400/1.47 求R 要埋方法PLZ

最佳解答:

(1 + y)^20 = 1.47 log(1 + y)^20 = log1.47 20 * log(1 + y) = log1.47 log(1 + y) = (1/20) * log1.47 log(1 + y) = log(1.47)^(1/20) 1 + y = 1.47^(1/20) y = [1.47^(1/20)] - 1 y ≈ 0.01945 (to 4 sig. fig.) ===== 400(1 - R)^24 = 400/1.47 (1 - R)^24 = 400/(1.47 * 400) (1 - R)^24 = 1/1.47 (1 - R)^24 = 1.47^(-1) log(1 - R)^24 = log(1.47)^(-1) 24 * log(1 - R) = log(1.47)^(-1) log(1 - R) = (1/24) * log(1.47)^(-1) log(1 - R) = log(1.47)^(-1/24) 1 - R = 1.47^(-1/24) R = 1 - [1.47^(-1/24)] R = 0.01592 (to 4 sig. fig.)

 

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其他解答:

(1+y)^20=1.47 1+y = (1.47)^1/20 y= 1.47^1/20-1 y=0.019449851 400(1-R)^24=400/1.47 1-R= (1/1.47)^(1/24) R= (1/1.47)^(1/24)+1 R=1.9841D1B39E80075704FD
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