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急 ! F4 about Polynomials
2011-11-04 6:56 pm
回答 (1)
2011-11-11 2:54 am
✔ 最佳答案
a)C(70) = 70^3 - 180(70^2) + 10700(70) -210000 = 0 => x - 70 is a factor of C(x)
b)
C(x) = (x - 70) (x^2 - 110x + 3000)
C(x) = (x - 70) (x - 50) (x - 60)
c)
i. C(110) = 120000
ii. by c(i) x = 110 => C(x) = 120000 conform the size of luggage
by b, length of luggage = 110-70, 110-50, & 110-60
= 40, 50, 60 cm < 130cm and 40+50+60cm < 170cm
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111104000051KK00173