7(1-n)/4=(5n+1)/2+0.4
要有steps
f.1 maths
2008-01-03 4:34 am
回答 (3)
2008-01-03 4:54 am
✔ 最佳答案
7(1-n)/4 = (5n+1)/2 + 0.47(1-n)/4 x 4 = (5n+1)/2 x 4 + 0.4 x 4
7(1-n) = 2(5n+1) + 1.6
7-7n = 10n + 2 + 1.6
10n + 2 + 1.6 = 7 - 7n
10n + 7n = 7 - 2 - 1.6
17n = 3.4
n = 3.4/17
=0.2
希望幫到你啦 !
2008-01-03 20:02:37 補充：
我自己係預科生 !
2008-01-03 4:59 am
7(1-n)/4=(5n+1)/2+0.4
[7(1-n)/4]x4=[(5n+1)/2]x4+0.4x4
7(1-n)=2(5n+1)+1.6
7-7n=10n+2+1.6
7-2-1.6=10n+7n
3.4=17n
n=0.2
[7(1-n)/4]x4=[(5n+1)/2]x4+0.4x4
7(1-n)=2(5n+1)+1.6
7-7n=10n+2+1.6
7-2-1.6=10n+7n
3.4=17n
n=0.2
2008-01-03 4:57 am
7(1-n)/4=(5n+1)/2+0.4
(7-7n)/4=(10n+2)+0.4
(7-7n)/4=10n+2+0.4
(7-7n)/4=10n+2.4
7-7n
------- =10n+2.4
4
7-7n=4(10n+2.4)
7-7n=40n+9.6
7-9.6=40n+7n
-2.6=47n
-2.6 47n
------ = -------
47 47
then就自己喇!!
mths要多做....
(7-7n)/4=(10n+2)+0.4
(7-7n)/4=10n+2+0.4
(7-7n)/4=10n+2.4
7-7n
------- =10n+2.4
4
7-7n=4(10n+2.4)
7-7n=40n+9.6
7-9.6=40n+7n
-2.6=47n
-2.6 47n
------ = -------
47 47
then就自己喇!!
mths要多做....
參考: myself....(我中二)
收錄日期: 2021-04-13 14:51:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080102000051KK03720