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1 ratio question
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最佳解答:
(a) A2B2 = 10 cm, A2A3 = 10 * 3/7 = 30/7 cm A2A3 : A1A2 = 30/7 : 6 = 30 : 42 = 5 : 7 (b) A1A2 + A2A3 + ... = 6 + 6(5/7) + 6(5/7)^2 + ... = 6/(1 - 5/7) = 42/2 = 21 cm So, the total distance crawled by the any cannot exceed 21 cm
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1 ratio question
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圖片參考：http://imgcld.yimg.com/8/n/HA00437808/o/701207240077413873412990.jpg plz step by step thanks a lot~最佳解答:
(a) A2B2 = 10 cm, A2A3 = 10 * 3/7 = 30/7 cm A2A3 : A1A2 = 30/7 : 6 = 30 : 42 = 5 : 7 (b) A1A2 + A2A3 + ... = 6 + 6(5/7) + 6(5/7)^2 + ... = 6/(1 - 5/7) = 42/2 = 21 cm So, the total distance crawled by the any cannot exceed 21 cm
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