Solve the simultaneous equations.
7 2 - 2 m + n = 6 m + 7 n = 3 m + 8 n - 2 5
F.2 數學~ 急!!!
2007-12-05 3:10 am
回答 (3)
2007-12-05 3:45 am
✔ 最佳答案
你冇問錯,只係前面2位............ 啦1. 72-2m+n=6m+7n
2. 3m+8n-25=6m+7n
in 1,
72-2m+n=6m+7n
72=8n+6n
m=[3(12-n)]/4 .........3
sub 2 into 3,
[9(12-n)]/4 +8n -25 = [18(12-n)]/4 +7n
n-25= [18(12-n)]/4 - [9(12-n)]/4
4n-100=108-9n
13n=208
n=16
因為n=16
所以 in 2,
3m+128-25=6m+112
-9=3m
m=-3
n=16 , m=-3
幫你覆過,實冇錯
2007-12-04 19:47:14 補充：
樓上果位計錯左= =""只要你代番入條式就知
參考: 自己, 當係溫下書, e條只係煩而不難
2007-12-05 3:19 am
你有無睇清楚問題 ??
2007-12-05 3:16 am
係咪打錯?
點解有2個等號?
點解有2個等號?
收錄日期: 2021-04-13 14:38:33
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