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Re:我搞不清是我理解错了还是这道题目有问题。希望相关人员关注一下。In Reply To:我搞不清是我理解错了还是这道题目有问题。希望相关人员关注一下。 Posted by:baicaitest at 2009-09-25 19:21:05 由题意知,V = π(R1^2*H1 + Ri^2*Hi + ... + Rm^2*Hm) = Nπ(当i < M时,要求Ri > Ri+1且Hi > Hi+1) > > 求Q = 2π(R1*H1 + Ri*Hi + ... + Rm*Hm)+ πR1^2 = Sπ使得S最小即2(R1*H1 + Ri*Hi + ... + Rm*Hm)+ R1^2最小. > > 那么根据数学公式求一下,当N = 100, M = 2时可求得(1)R1 = 4,H1 = 6; R2 = 2,H2 = 1.(2)R1 = 4,H1 = 6; R2 = 1,H2 = 4.(3)R1 = 3,H1 = 11; R2 = 1,H2 = 1 > 则 最小的S = 2*(4*6 + 2*1) + 4*4 = 68,即第一组.(都是程序求出来的) Followed by: Post your reply here: |
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