f.4數..難唔到你,,難到我,,^^

(√5+√145)/4 or (√5-√145)/4

2007-09-15 19:47:58 補充：
....^0^"是(√5+√245)/4 or (√5-√245)/4(√5+7√5)/4 or (√5-7√5)/48√5/4 or -6√5/4= 2√5 or -1.5√5....^0^謝謝下家....之前繼錯左

2007-09-15 19:48:13 補充：
....^0^"是(√5 √245)/4 or (√5-√245)/4(√5 7√5)/4 or (√5-7√5)/48√5/4 or -6√5/4= 2√5 or -1.5√5....^0^謝謝下家....之前繼錯左

2007-09-15 19:50:38 補充：
同買thins is quadratic equations 同下家的方法不同他是用cross method

2007-09-15 19:56:34 補充：
還有的是下下下下家ga (tony141192)用的方法同我一樣但是他繼錯不是(√5)^2土√(√5^2-4(2)(-30)______________________2(2)a位是2 位是-√5 c位是-30 and the equation (-b土(b^2-4ac))/2aso the equation should be (-√5土((√5^2)-4(2)(-30)))/2(2)then (-√5土(5 240)/4

(√5)^2土√(√5^2-4(2)(-30)
______________________
2(2)


5土√25+240
___________
4


5土√270
________
4



搞掂

Ans:
2x^2-√5x-30=0
(2x + 3√5)(x - 2√5)=0
x = -(3√5)/2 or 2√5
希望大家給我最佳解答~
thx~

2x^2-√5x-30=0
(2x + 3√5)(x - 2√5)=0
x = -(3√5)/2 or 2√5

2x^2-√5x-30=0
=> (2x + 3√5)(x - 2√5)=0
=> x = -(3√5)/2 or 2√5

2007-09-15 19:34:57 補充：
上家的答案是錯的,請注意.