原帖由 trt24418132 於 2015-8-26 05:01 PM 發表
Let AE=k cm ,AF=2k cm, area of triangle CEF=y cm2
triangle CEF=y=a^(2)-2k^(2)(1/2)-(a-2k)(a)(1/2)-(a-k)(a)(1/2)
y =a^(2)-k^(2)-a^(2)+(3ak)/2
dy/d ...
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