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Mathematical Problem
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最佳解答:
1. [2sqrt(3)]^2 = 12 = 4 + 4 + 4 = 2^2 + 2^2 +2^2 So, angle BAD = angle CBD = 90 degree 2. (a-1)x^2+2x+1=0 不是一元二次方程 即 a-1 = 0 ...... a=1 方程x^2=b只有一個解 ..... 即 b=0 ax^2+(b+1)x+1/4=0 即是 x^2 + x + 1/4 = 0 (x + 1/2)^2 = 0 x = -1/2 2007-09-02 18:21:07 補充： 呃.....搞亂o左o的次序 ..... 畫返o岩個圖會見到 angle BAD = angle BAC + angle CAD = 45 + 90 = 135 degree
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Mathematical Problem
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1.In quadrilateral ABCD,AB,BC,CD,DA are 2,2,2square root3,2 respectively.Angle BAD=? 2.(a-1)x^2+2x+1=0 不是一元二次方程，方程x^2=b只有一個解，解ax^2+(b+1)x+1/4=0最佳解答:
1. [2sqrt(3)]^2 = 12 = 4 + 4 + 4 = 2^2 + 2^2 +2^2 So, angle BAD = angle CBD = 90 degree 2. (a-1)x^2+2x+1=0 不是一元二次方程 即 a-1 = 0 ...... a=1 方程x^2=b只有一個解 ..... 即 b=0 ax^2+(b+1)x+1/4=0 即是 x^2 + x + 1/4 = 0 (x + 1/2)^2 = 0 x = -1/2 2007-09-02 18:21:07 補充： 呃.....搞亂o左o的次序 ..... 畫返o岩個圖會見到 angle BAD = angle BAC + angle CAD = 45 + 90 = 135 degree
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