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Help! F1 Maths唔識做啊T^T
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Ratio真係好難呀,唔該各位幫幫手啦!我完全唔識點計呀...p.s.唔該列式,列步驟同埋題解,plz!1.A lamp post is painted in black and white in the ratio of 3:2.If the length of the white portion is 4m,find the lengthof the lamp post.2.Carmen spends 15%,30% and 35% of her pocket money on transpotation,lunch and savings respectively,and the... 顯示更多 Ratio真係好難呀,唔該各位幫幫手啦! 我完全唔識點計呀... p.s.唔該列式,列步驟同埋題解,plz! 1.A lamp post is painted in black and white in the ratio of 3:2.If the length of the white portion is 4m,find the lengthof the lamp post. 2.Carmen spends 15%,30% and 35% of her pocket money on transpotation,lunch and savings respectively,and the rest is spent on entertainment.Find the ratio of the amounts spent on transportation,lunch and entertainment. 3.The length of a wire is 360 cm. (a) If it is divided into 3portions in the raio of 1 : 3 : 8,find the length of the longest portion. (b) If the wire with the longest portion is bent into a rectangle with its length and width in the ratio of 3:2,find the length and width of the rectangle. 更新: 請大家以英文回答問題,plz~
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圖片參考：http://j.imagehost.org/0129/ScreenHunter_01_May_13_11_31.gif http://j.imagehost.org/0129/ScreenHunter_01_May_13_11_31.gif
其他解答:
Help! F1 Maths唔識做啊T^T
發問:
Ratio真係好難呀,唔該各位幫幫手啦!我完全唔識點計呀...p.s.唔該列式,列步驟同埋題解,plz!1.A lamp post is painted in black and white in the ratio of 3:2.If the length of the white portion is 4m,find the lengthof the lamp post.2.Carmen spends 15%,30% and 35% of her pocket money on transpotation,lunch and savings respectively,and the... 顯示更多 Ratio真係好難呀,唔該各位幫幫手啦! 我完全唔識點計呀... p.s.唔該列式,列步驟同埋題解,plz! 1.A lamp post is painted in black and white in the ratio of 3:2.If the length of the white portion is 4m,find the lengthof the lamp post. 2.Carmen spends 15%,30% and 35% of her pocket money on transpotation,lunch and savings respectively,and the rest is spent on entertainment.Find the ratio of the amounts spent on transportation,lunch and entertainment. 3.The length of a wire is 360 cm. (a) If it is divided into 3portions in the raio of 1 : 3 : 8,find the length of the longest portion. (b) If the wire with the longest portion is bent into a rectangle with its length and width in the ratio of 3:2,find the length and width of the rectangle. 更新: 請大家以英文回答問題,plz~
最佳解答:
圖片參考：http://j.imagehost.org/0129/ScreenHunter_01_May_13_11_31.gif http://j.imagehost.org/0129/ScreenHunter_01_May_13_11_31.gif
其他解答:
此文章來自奇摩知識+如有不便請留言告知
1. black and white in the ratio of 3:2 → 3個黑色長度等於2個白色長度 → 1個白色 = 1.5黑色 (3/2) → 而白色是4cm > 所以4 x 1.5 = 6 黑色 2. 剩餘去用於娛樂為 20%, 所以比例為15 : 30 : 20 ，約簡，即3:6:4 3. 條線有12段，360 / 12 = 30 ，最短的一part 為30 cm ，最長的一段是最短的8倍，所以30 x 8 = 240 cm 4. 最長的一段是240 cm，長方形有2邊相等。 如果長的一段是3 cm，闊一段是2 cm；如果長的一段是1.5 cm，闊的一段是1 cm 所以長+闊 = 5段 ，由於2邊相等的關係，再x2 ，整個長方形有10段， 240 / 10 = 24，一段有24 cm，長有3段，即72cm，闊有2段，即48cm
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