補充公式因式分解

補充公式因式分解

有鑑於偶有人問到相似題, 故整理於下, 供參考

 

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x^p+x^n+1.....這類的因式分解方法與技巧

x^p+x^n+1.....因式分解技巧

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poisson's distribution

 

 

http://zh.wikipedia.org/zh-tw/%E6%B3%8A%E6%9D%BE%E5%88%86%E4%BD%88

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[挑戰]正三角形內切兩圓

[挑戰]正三角形內切兩圓

 

ΔABC is equilateral with side length 4. D is a point on BC such that BD = 1. If r and s are the radii of the inscribed circles of ΔADB and ΔADC respectively, find rs.

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三角形垂心證明(HK)

In ΔABC, AB=AC=13 and BC=10. P is a point on BC with BP<PC, and H,K are
the orthocentres of ΔAPB and ΔAPC respectively. If HK=2, find PC.

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your steps with suitable diagram(s)

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[挑戰]中點,平分證平行

三角形ABC, D在AB邊上, E在AC邊上, F在BC邊上
AF交DE於O, O是DE中點, OB是角DOF平分線, OC是角EOF平分線
證==>DE平行BC

原連結

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五邊形求角度, 四邊相等, 已知三角, 求剩餘角(hk)

In pentagon ABCDE, AB=BC=CD=DE, ∠B = 96˚ and ∠C=∠D=108˚. Find ∠E.

原連結

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