20點~ 急~~ fact complex equation

2012-01-20 9:02 pm
Find the exact solution of the following inequality. You must solve for all zeroes of the cubic, both real and complex.

x ^ 3 +10 > 0
更新1:

To hung 我都係咁答我呀sir, 但係佢話我個ans incomplete, 因為我冇mention 到 (x^2 - 10^1/3x + 10^2/3) 得出黎既 complex inequality . 如果我冇聽錯,佢好似係要我解釋埋(x^2 - 10^1/3x + 10^2/3) 得出黎既係 all positive 定係 all negative. 但係我又唔係好明佢究竟要我解釋d 咩......

回答 (2)

2012-01-20 9:58 pm
✔ 最佳答案
complex number 好似冇得比大小ga wo 點會出現係inequality

2012-01-20 13:58:39 補充:

圖片參考:http://imgcld.yimg.com/8/n/HA00482599/o/701201200029513873422010.jpg

希望幫到你~~~~~~

2012-01-20 13:59:16 補充:
ineq. 果陣淨係consider real x , 因為complex 好似冇得比較大小
2012-01-23 2:07 am
同意樓上所講
不可排序

如果X和Y是任意兩個複數,那麼它們之間是無法按照「<」或「>」排列順序的。因為對於複數給出排序定義且使他滿足「序公理」是不可能的。
http://zh.wikipedia.org/wiki/%E5%A4%8D%E6%95%B0_%28%E6%95%B0%E5%AD%A6%29#.E4.B8.8D.E5.8F.AF.E6.8E.92.E5.BA.8F


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