標題:
algebra!10pts
發問:
A ladder is resting against a wall. The top of the ladder touches the wall at a height of 15feet. Find the distance from the wall to the bottom of the ladder if the length of the ladder is one foot more than twice its distance from... 顯示更多 A ladder is resting against a wall. The top of the ladder touches the wall at a height of 15feet. Find the distance from the wall to the bottom of the ladder if the length of the ladder is one foot more than twice its distance from wall. 有把梯靠住個牆.把梯最尖點住個牆係15ft高.找佢geh距離由個牆底去到最底geh梯.把梯長度係2x+1geh距離由個牆底去到最底geh梯! 要用quadratic fomula黎計! 中英okay!
最佳解答:
- 火影忍者動畫_9
- 我要Ben Wallace既資料!!!
- 名偵探柯南 20分 幫下我呀
- 為子女選校.......好煩惱
- 是誰翻譯bunji jump做笨豬跳的？
- 基本髮型技巧~化妝技巧~
- 急問荃灣馬會近大窩口正確位置---@1@
- 我想問前利物浦球星希斯基而家踢緊邊隊-
- 數學圓形圖的問題@1@
- 秦代速亡是困為統一政策嗎-(300字)20分!!!
此文章來自奇摩知識+如有不便請留言告知
Let x be the distance from the wall. length of ladder = 2x+1 (2x+1)^2 = x^2 + 15^2 4x^2 + 4x + 1 = x^2 + 225 3x^2 + 4x - 224 = 0 (3x+28)(x-8) = 0 x = -28/3 (rejected) or x = 8 Therefore, length of ladder = 8 feet
其他解答:
Let X be the distance from the wall to the bottom of the ladder. Then: 15^2 + X^2 = (2X + 1)^2 (畢氏定理) 225 + X^2= 4X^2+4X+1 3X^2 + 4X - 224 = 0 (3x + 28) (X - 8) = 0 Then X = -28 or X = 8 Reject the answer -28 Ans : X = 8 i.e. the distance from the wall to the bottom of the ladder is 8ft 2008-04-17 15:22:16 補充： X = -28/37638E7481407D16B
留言列表
