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【纪念当年的帖子（2010）】Add Maths功课讨论区
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发表于 29-4-2010 11:39 PM
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回复 500# 乙劍真人
原来要分开做。。。。害我做得要死，够笨的我。 |
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发表于 29-4-2010 11:40 PM
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发表于 29-4-2010 11:40 PM
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发表于 29-4-2010 11:43 PM
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发表于 29-4-2010 11:51 PM
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回复 乙劍真人
原来要分开做。。。。害我做得要死，够笨的我。
Enceladus 发表于 29-4-2010 11:39 PM 
不是笨啦，是你刚开始接触还不熟悉罢了啦.. 加油.. |
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发表于 29-4-2010 11:54 PM
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回复 505# 乙劍真人
会的会的，我会加把劲的！ |
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发表于 30-4-2010 12:05 AM
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回复 507# 乙劍真人
对对，也要真人你来拉我一把才可以成功。{:2_78:} |
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发表于 30-4-2010 12:06 AM
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发表于 30-4-2010 12:15 AM
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回复 乙劍真人
对对，也要真人你来拉我一把才可以成功。
Enceladus 发表于 30-4-2010 12:05 AM
要考到好成绩90%是必须靠自己的，外人辅导你的只不过占少数功劳而已..^^ |
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发表于 30-4-2010 12:21 AM
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本帖最后由 Enceladus 于 30-4-2010 06:17 AM 编辑
回复 510# 乙劍真人
我知道，不过我也很感激你们给予我的协助。 |
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发表于 30-4-2010 12:28 AM
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回复 乙劍真人
我知道，不过我也很感激你们给予我的协助。
Enceladus 发表于 30-4-2010 12:21 AM 
所以你必须用心搞好这科哦，成绩有进步就算是报答我们了..^^ |
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发表于 30-4-2010 01:30 PM
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发表于 30-4-2010 01:36 PM
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4 different Physics Books,5 different Chemistry books and 6 different Biology books are to be arranged in a bookcase. If the books of the same subject have to be placed together, calculate the number of possible arrangements.
这题我刚才在做，可是做了很久，答案差了很多。答案是12441600 。。。。。。
请帮帮我，谢谢 |
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发表于 30-4-2010 01:50 PM
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4 different Physics Books,5 different Chemistry books and 6 differentBiology books are to be arranged in a bookcase. If the books of thesame subject have to be placed together, calculate the number ofpossible arrangements.
这题我刚才在做，可是做了很久，答案差了很多。答案是12441600 。。。。。。
请帮帮我，谢谢
Enceladus 发表于 30-4-2010 01:36 PM 
4P4 x 5P5 x 6P6 = 2073600
但是，你别忘了这三组是可以换位的哦，所以 2073600 x 3P3 = 12441600 ways |
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发表于 30-4-2010 01:55 PM
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回复 515# 乙劍真人
原来还有一个步骤，怪不得我做到很奇怪。谢谢师傅的提醒和教导。 |
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发表于 1-5-2010 03:05 PM
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請指教3題integration 的volume of revolution 問題..謝謝
1)If the area enclosed by the curve y=x^2 and the line y=4 is revolved through 180 degree about the y-axis,find the volume of the solid and generated by the revolution.
2)The region bounded by the curve y=4x-x^2 and the straight line y=3 is revolved completely about the x-axis.Find the volume of revolution of the solid that is so generated.
3)Find the area bounded by curve y=x^2-3x and the x-axis.if this area is revolved through 180 degree about the x-axis,find the volume of revolution |
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发表于 1-5-2010 05:59 PM
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請指教3題integration 的volume of revolution 問題..謝謝
1)If the area enclosed by the curve y=x^2 and the line y=4 is revolvedthrough 180 degree about the y-axis,find the volume of the solid andgenerated by the revolution.
2)The region bounded by the curve y=4x-x^2 and the straight line y=3 isrevolved completely about the x-axis.Find the volume of revolution ofthe solid that is so generated.
3)Find the area bounded by curve y=x^2-3x and the x-axis.if this areais revolved through 180 degree about the x-axis,find the volume ofrevolution
永遠愛著許瑋倫 发表于 1-5-2010 03:05 PM
你先检查看答案对吗..
1. 4 pi
2. 442/15 pi
3. A = 9/2 ; V = 81/20 pi |
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发表于 1-5-2010 06:19 PM
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你先检查看答案对吗..
1. 4 pi
2. 442/15 pi
3. A = 9/2 ; V = 81/20 pi
乙劍真人 发表于 1-5-2010 05:59 PM 
1的答案是8 pi
2的答案是28.49unit^3
3的area是1/6 unit^2 ,V是81/20 pi..也就是對了 |
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发表于 1-5-2010 06:23 PM
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第一題的答案是不是做到8 pi之後然後要除2?因為180 degree
书的答案是8 pi..第一题应该是书错吧？ |
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发表于 1-5-2010 06:29 PM
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本帖最后由 永遠愛著許瑋倫 于 1-5-2010 06:31 PM 编辑
form 5 add maths课本
第3题那个area我也是做到9/2而已 leh
如果确定是课本的错...那我只求你show 第二题的solution给我..谢谢 |
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