數學方程!!中一
回答 (7)
2006-11-12 10:25 pm
✔ 最佳答案
7k-(9k-16)=14-(19-k) 7k-9k+16=14-19+k (拆括號，負負得正。)
7k-9k-k=14-19-16
-3k=-21
k=-7
2006-11-12 10:48 pm
7k-(9k-16)=14-(19-k)
7k-9k 16=14-19 k
7k-9k-k=14-19-16
-3k = -21
k = 7
7k-9k 16=14-19 k
7k-9k-k=14-19-16
-3k = -21
k = 7
2006-11-12 10:29 pm
7k-(9k-16)=14-(19-k)
7k-9k+16=14-19+k
7k-9k-k=14-19-16
-3k=-21
k=?(自己計啦)
7k-9k+16=14-19+k
7k-9k-k=14-19-16
-3k=-21
k=?(自己計啦)
參考: 記住:負負得正,正正得正,負正得負,正負得負
2006-11-12 10:23 pm
7k-(9k-16) = 14-(19-k)
7k-9k+16 = 14-19+k
16-14+19 = k-7k+9k
21 = 3k
k = 7
7k-9k+16 = 14-19+k
16-14+19 = k-7k+9k
21 = 3k
k = 7
2006-11-12 10:23 pm
7k-(9k-16)=14-(19-k)
7k-9k+16=14-19+k
-2k-k=-5-16
-3k=-21
k=7
7k-9k+16=14-19+k
-2k-k=-5-16
-3k=-21
k=7
2006-11-12 10:22 pm
7k-(9k-16)=14-(19-k)
7k-9k+16=14-19+k
7k-9k-k=14-16
-3k = -2
k = 2/3
2006-11-12 14:23:42 補充：
我錯左，不過樓上都錯左！！我修正，要最佳回答！！！7k-(9k-16)=14-(19-k)7k-9k 16=14-19 k7k-9k-k=14-19-16-3k = -21k = 7
7k-9k+16=14-19+k
7k-9k-k=14-16
-3k = -2
k = 2/3
2006-11-12 14:23:42 補充：
我錯左，不過樓上都錯左！！我修正，要最佳回答！！！7k-(9k-16)=14-(19-k)7k-9k 16=14-19 k7k-9k-k=14-19-16-3k = -21k = 7
2006-11-12 10:22 pm
7k-(9k-16)=14-(19-k)
7k-9k+16=14-19+k
7k-9k-k=14-19-16
-3k=-21
k=-7
2006-11-12 20:04:44 補充：
sorry,打多左個負號,應為k=7
7k-9k+16=14-19+k
7k-9k-k=14-19-16
-3k=-21
k=-7
2006-11-12 20:04:44 補充：
sorry,打多左個負號,應為k=7
收錄日期: 2021-04-12 23:45:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061112000051KK02510