[考古] 98政大國貿微積分

看板trans_math作者 (肯泰羅)時間15年前 (2010/06/18 23:00), 編輯推噓2(2推 0噓 4→)
留言6則, 1人參與, 最新討論串1/1
98年政大國貿微積分第10題 原考題：http://img638.imageshack.us/img638/9569/22679131.jpg
A ladder 26 ft long leans against a vertical wall. If the lower end is moved away from the wall at the rate of 5(ft/sec), how fast is the height of the top decreasing when the the lower end is 10 ft from the wall? 不知道該怎麼解 想請大家幫忙給一些頭緒 若能幫忙詳細解答更佳^^" 拜託了 感謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.33.56.62
推
06/19 00:54, , 1F
畢氏定理+全微分
06/19 00:54, 1F
推
06/19 01:25, , 2F
x^2+y^2=26^2
06/19 01:25, 2F
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06/19 01:26, , 3F
對t微分 然後題目給的帶進去
06/19 01:26, 3F
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06/19 01:27, , 4F
dx/dt=5 且x=10 故y=24 (畢氏定理)
06/19 01:27, 4F
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06/19 01:27, , 5F
只剩下dy/dt待解而已= =
06/19 01:27, 5F
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06/19 01:28, , 6F
這題也算長考的題目@@@@
06/19 01:28, 6F
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