2絛maths諗爆頭－香港特色

標題:

2絛maths諗爆頭

發問:

求x http://img411.imageshack.us/i/23013313.png/ ------------------------------------------------------------------------------------- 證明AB^2+CD^2=AC^2+BD^2 http://img180.imageshack.us/i/17280464.png/ 更新: [url]http://img411.imageshack.us/i/23013313.png/[/url] [url]http://img180.imageshack.us/i/17280464.png/[/url] 更新 2: COPY絛link上網址到都ok

最佳解答:

AB^2=BD^2+AD^2(Pyth.theorem) CD^2+AD^2=AC^2(Pyth.theorem) CD^2..........=AC^2-AD^2 AB^2+CD^2 BD^2+AD^2+AC^2-AD^2 AC^2+BD^2 2010-07-16 14:49:29 補充： Q2 is very easy 2010-07-16 15:02:15 補充： Q1: height=12 8^2+8^2=y^2 y.........=8sqrt2 (8sqrt2)/2 =4sqrt2 _______________________ (4sqrt2)^2+12^2=x^2 x.....................=4sqrt11 ________________________

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