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f.3 maths help...>
發問:
http://hk.geocities.com/suki_tang2004/a.bmp 姐係有building a 同building b...... a既高度係100m(寫得好核特...-.-) a題話find the distance between the2 building. 我試過搵a同b下個條都搵唔到....-.- a題既答案係48.4m b題問find the height of building b....(答案係77.4m) 呢2題..一開始就唔識了..-.-very thx~ 答案知道..但唔識點搵.. 總之幫到我就好thx你啦..
最佳解答:
(a) 我地可以代數, 分別搵a既上面o個part同下面o個part, 加埋就會係100m, 即係.. let x be the distance between a and b, let a1 be the upper part of a and a2 be the lower part of a, tan 25=a1 / x a1 = xtan 25 and, tan 58=a2 / x a2 = xtan 58 a1+a2=100 so, xtan 25 + xtan 58 = 100 x( tan 25 + tan 58) = 100 x = 48.387.... x = 48.4m (b) a2其實就係the height of building b, 所以可以put番d數入去~ the height of building b =a2 =(48.387....)tan 58 =77.436... =77.4m 2008-03-16 09:59:59 補充： 其實(a) 真係做o個時可以簡單d唔使代咁多數, 寫哂a1,a2出黎係想你易d明~ 希望幫到你啦=)
其他解答:
f.3 maths help...>
發問:
http://hk.geocities.com/suki_tang2004/a.bmp 姐係有building a 同building b...... a既高度係100m(寫得好核特...-.-) a題話find the distance between the2 building. 我試過搵a同b下個條都搵唔到....-.- a題既答案係48.4m b題問find the height of building b....(答案係77.4m) 呢2題..一開始就唔識了..-.-very thx~ 答案知道..但唔識點搵.. 總之幫到我就好thx你啦..
最佳解答:
(a) 我地可以代數, 分別搵a既上面o個part同下面o個part, 加埋就會係100m, 即係.. let x be the distance between a and b, let a1 be the upper part of a and a2 be the lower part of a, tan 25=a1 / x a1 = xtan 25 and, tan 58=a2 / x a2 = xtan 58 a1+a2=100 so, xtan 25 + xtan 58 = 100 x( tan 25 + tan 58) = 100 x = 48.387.... x = 48.4m (b) a2其實就係the height of building b, 所以可以put番d數入去~ the height of building b =a2 =(48.387....)tan 58 =77.436... =77.4m 2008-03-16 09:59:59 補充： 其實(a) 真係做o個時可以簡單d唔使代咁多數, 寫哂a1,a2出黎係想你易d明~ 希望幫到你啦=)
其他解答:
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