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～ｐｋ～四星黃金會員 2011-3-1 11:37#1

做到最尾一條唔識做…

NaozumiVIP會員 2011-3-1 23:08#2

By similar triangles, y/12 = 2/x
dx/dt = 1.6
When the men is 4 m away from the building, x = 8

(1/12) dy/dt = -2/x^2 (dx/dt)
sub番d數入去就OK啦

[ 本帖最後由 Naozumi 於 11-3-1 11:10 PM 編輯 ]

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