[計量] 問幾題數學...

看板GRE作者 (￾  N￾N )時間16年前 (2009/05/16 03:00), 編輯推噓3(3推 0噓 3→)
留言6則, 2人參與, 最新討論串3/3 (看更多)
1. One side of a triangle has length 6 and a second side has length 7. Which of the following could be the area of this triangle? I. 13 II. 21 III.24 (A) I only (B) II only (C) III only (D) I and II only (E) I, II, and III Ans: D 2. An obtuse triangle has sides of length of 11, 15 and k, where k is an integer. The number of values of k 13 Ans: C 麻煩各位高手了... 謝謝喔^^ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 219.84.65.224
推
05/16 04:28, , 1F
7409有解答
05/16 04:28, 1F
推
05/16 04:40, , 2F
11+15>k>(11^2+15^2)的平方根 = 26>k>18.x 有7個
05/16 04:40, 2F
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05/16 04:41, , 3F
(15^2-11^2)的平方根>k>15-11 = 10.x>k>4 有6個
05/16 04:41, 3F
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05/16 04:42, , 4F
一共13個 不過方法好像有點笨... 應該有更好的方法
05/16 04:42, 4F
推
05/16 04:44, , 5F
其實用全部減銳角三角形的個數 應該比較快 XD
05/16 04:44, 5F
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05/17 11:52, , 6F
謝謝你喔~我懂了^^
05/17 11:52, 6F
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