[DSE 2021] 大家準備好瘋狂做 數學 未呢？ [5]

好靜

忙到仆街😂

忙到仆街

哇屌咁撚勁
快d擺m1上小卒比我更新😍😍

個樓主就係我啦嘛

2020 拎4，2021 retake m0+新修m1留名

唔係好關DSE事, 但我整咗啲數學片
https://www.youtube.com/watch?v=kRzSif605hc
https://www.youtube.com/watch?v=uHMxUZlL6-U
https://www.youtube.com/watch?v=cNspcAS2usE
https://www.youtube.com/watch?v=D_wyp_N9OOs

關DSE事,都有啲

https://www.youtube.com/watch?v=8fTBkkRrM4w
https://www.youtube.com/watch?v=fry39KtD0lQ
https://www.youtube.com/watch?v=68Pi4RJ1Rnw
https://www.youtube.com/watch?v=7k3oMhNU4DU

我知有啲音樂99哋
鍾意就SUB啦,THANKS

😹

Find the maximum area of a triangle that can be inscribed in a circle with radius r and find the lengths of the three sides of such a triangle.

A=bh/2=> 用pyth. 將h換做r=> 成條式對b diff.之後put做0=> 計到b=sqrt3*r (equilateral triangle)會係maximum area。

我係用個angle嚟做optimisation
你嗰個似乎簡單啲

😥

我從來唔會同一份卷做2次
好哂時間😅

可摸耳幫下手
已知a,b,c>0, a+b+c=1
而家要證明a^2/b+b^2/c+c^2/a大過或等於1
點做...

點解OUT-.-