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qjf880726

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[ÇóÖú] matlabÐÂÊÖÇóÖúһϹØÓÚ½â¾öÒ»´Î·½³Ì½âÎö½âµÄÎÊÌâ

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y=solve('y^3-5*k/m*y^2+6*k^2/m^2*y-k^3/m^3')
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y =

[                                                                           (1/6*(28+84*i*3^(1/2))^(1/3)+14/3/(28+84*i*3^(1/2))^(1/3)+5/3)*k/m]
[ (-1/12*(28+84*i*3^(1/2))^(1/3)-7/3/(28+84*i*3^(1/2))^(1/3)+5/3+1/2*i*3^(1/2)*(1/6*(28+84*i*3^(1/2))^(1/3)-14/3/(28+84*i*3^(1/2))^(1/3)))*k/m]
[ (-1/12*(28+84*i*3^(1/2))^(1/3)-7/3/(28+84*i*3^(1/2))^(1/3)+5/3-1/2*i*3^(1/2)*(1/6*(28+84*i*3^(1/2))^(1/3)-14/3/(28+84*i*3^(1/2))^(1/3)))*k/m]

>>
Õâ¸öÊÇÊéÉϵķ½³Ì£¬ÊéÉϸø³öµÄ½âûÓи´Êýi£¬²»ÖªµÀΪʲôÓÃmatlab6Çó½âºóµÃµ½Á˸´ÊýiÁËÄØ£¿£¿ÕæÐÄÇó°ï×飬ÎҵıҲ»¶à ¼ûÁÂ
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dbb627

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y=solve('y^3-5*k/m*y^2+6*k^2/m^2*y-k^3/m^3','y')

y =

                                                                                                                                                      ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) + (5*k)/(3*m) + (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3))

(5*k)/(3*m) - ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)/2 - (7*k^2)/(18*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)) - (3^(1/2)*(((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) - (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)))*i)/2

(5*k)/(3*m) - ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)/2 - (7*k^2)/(18*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)) + (3^(1/2)*(((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) - (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)))*i)/2
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2012-07-19 21:34:56
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

3´Î´úÊý·½³Ì£¬½â³öÀ´´øiÒ²Õý³£
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
3Â¥2012-07-19 21:37:00
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

qjf880726

¾èÖú¹ó±ö (ÕýʽдÊÖ)

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ÒýÓûØÌû:
3Â¥: Originally posted by dbb627 at 2012-07-19 21:37:00
3´Î´úÊý·½³Ì£¬½â³öÀ´´øiÒ²Õý³£

ºÇºÇ лл ÎÒµÄÎÊÌâ½â¾öÁË Ô­À´ÎÒ°ÑÎÒÐİ®µÄmatlab6.5»»³ÉÂÛ̳ÀïÌṩÏÂÔØµÄmatlab2012ºóÔÙÊäÈë¾ÍÕý³£ÁË ºÜÉñÆæ ÎÒÊǸ÷ÖÖÎÞÓï¡£¡£¡£

>> y=solve('y^3-5*k/m*y^2+6*k^2/m^2*y-k^3/m^3')

y =

                                                                                                                                                      ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) + (5*k)/(3*m) + (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3))
(5*k)/(3*m) + (3^(1/2)*(((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) - (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)))*i)/2 - ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)/2 - (7*k^2)/(18*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3))
(5*k)/(3*m) - (3^(1/2)*(((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3) - (7*k^2)/(9*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)))*i)/2 - ((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3)/2 - (7*k^2)/(18*m^2*((-(49*k^6)/(108*m^6))^(1/2) + (7*k^3)/(54*m^3))^(1/3))

>>
»¶Ó­½»Á÷ú̿»úе¹¤³Ì»úе
4Â¥2012-07-19 22:29:55
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

°²»ÕÁù°²»úÆ÷

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