標題:
f.4 maths
發問:
圖片參考：http://imgcld.yimg.com/8/n/HA04937267/o/701108300111813873451290.jpg ans:28,194
最佳解答:
Given x^(1/2) + x^(-1/2) = 4 x + 2 + 1/x = 16 (By Squaring both sides) x + 1/x = 14 -----------------(*) Hence, 2x + 2/x = 28 Squaring both sides of (*), x^2 + 2 + 1/x^2 = 256 Hence, x^2 + 1/x^2 = 254 2011-08-30 19:15:20 補充： Correction: x^2 + 2 + 1/x^2 = 196 x^2 + 1/x^2 = 194
其他解答:
file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5% 90%8 D.bmp file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5%90%8D1.bmp 2011-08-30 19:32:52 補充： file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5%90%8D.bmp 2011-08-30 19:35:04 補充： 對不起,第一個是開不到
f.4 maths
發問:
圖片參考：http://imgcld.yimg.com/8/n/HA04937267/o/701108300111813873451290.jpg ans:28,194
最佳解答:
Given x^(1/2) + x^(-1/2) = 4 x + 2 + 1/x = 16 (By Squaring both sides) x + 1/x = 14 -----------------(*) Hence, 2x + 2/x = 28 Squaring both sides of (*), x^2 + 2 + 1/x^2 = 256 Hence, x^2 + 1/x^2 = 254 2011-08-30 19:15:20 補充： Correction: x^2 + 2 + 1/x^2 = 196 x^2 + 1/x^2 = 194
其他解答:
file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5% 90%8 D.bmp file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5%90%8D1.bmp 2011-08-30 19:32:52 補充： file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E6%9C%AA%E5%91%BD%E5%90%8D.bmp 2011-08-30 19:35:04 補充： 對不起,第一個是開不到
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