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thanks:):):)
更新1:
詳細列式啊thanks!!
4條f.2升f.3數學(公式)(10點!!)
2011-08-27 3:58 am
圖片參考：http://imgcld.yimg.com/8/n/HA04844646/o/701108260102813873449340.jpg
thanks:):):)
回答 (2)
2011-08-28 3:24 am
✔ 最佳答案
1(a) P=2(L+b)P/2=L+b
(P/2)-b=L
L=(P/2)-b
(b) L=(P/2)-b
=(40/2)-8
=12
2(a) S=n(n+1) /2
=[50(50+1)]/2
=1275
(b)S=n(n+1) /2
=[(50-11)(50-11+1)]/2
=780
2011-08-27 4:27 am
1(a) P = 2(l + b)
(b) 40 = 2(l + 8)
l = 12
2(a) S = 50(51)/2 = 1275
(b) 所求 = S(50) - S(10) = 1275 - 55 = 1220
(b) 40 = 2(l + 8)
l = 12
2(a) S = 50(51)/2 = 1275
(b) 所求 = S(50) - S(10) = 1275 - 55 = 1220
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110826000051KK01028