這是中一ｍａｔｈｓ的問題
回答 (4)
2006-10-17 4:47 am
✔ 最佳答案
7k - 9k +16 = 14 - 19 + k-2k + 16 = -5 + k
-2k - k = -5 - 16
-3k = -21
k =7
Check: Substitute k=7 into the equation
L.H.S.= 7(7) -(9(7) - 16) =49 - (63 -16) = 49 -47 = 2
R.H.S. = 14 - (19 - 7) = 14 - 12 = 2 = R.H.S.
2006-10-17 9:01 pm
7k-9k+16=14-19+k
16-2k=k-5
3k=21
k=7
16-2k=k-5
3k=21
k=7
2006-10-17 6:38 am
７ｋ－（９ｋ－１６）＝１４－（１９－ｋ）
7k - 9k + 16 = 14 - 19 + k
7k - 9k - k = 14 - 19 - 16
(7 - 9 - 1) k = - 21
-3 k = - 21
k = 7
7k - 9k + 16 = 14 - 19 + k
7k - 9k - k = 14 - 19 - 16
(7 - 9 - 1) k = - 21
-3 k = - 21
k = 7
2006-10-17 4:42 am
7k - ( 9k - 16 ) = 14 - ( 19 - k )
7k - 9k + 16 = 14 - 19 + k
16 - 2k = - 5 + k
3k = 21
k = 7
7k - 9k + 16 = 14 - 19 + k
16 - 2k = - 5 + k
3k = 21
k = 7
參考: myself
收錄日期: 2021-04-12 21:23:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061016000051KK03738