標題:

急急急急 正變問題 數學!!

發問:

設p比比於q ,,,若q增加15% ,,求p的百分數改變 仲有一條 設a隨 e的平方而正變 ,,若 r 增加了10%,,求a 的百分數改變..

最佳解答:

1) 設p比比於q ,,,若q增加15% ,,求p的百分數改變 Let p = kq where k is a constant, and p' = k(q') where p' andn q' are their new values q' = q(1+15%) = 1.15q p' = k(1.15q) = 1.15(kq) = 1.15p = (1+15%)p p is increased by 15% ************************** 2) 設a隨 e的平方而正變 ,,若 r 增加了10%,,求a 的百分數改變 (若e增加了10%?) Let a = k(e)^2 where k is a constant, and a' = k(e')^2 where a' and e' are their new values e' = e(1+10%) = 1.1e a' = k(1.1e)^2 = 1.21[k(e)^2] = 1.21a = e(1+21%) a is increased by 21%

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