中一數學一題(方程式)

2007-10-05 3:41 am
7k-(9k-16)=14-(19-k)
k=?

回答 (3)

2007-10-05 3:45 am
✔ 最佳答案
7k-(9k-16)=14-(19-k)
7k-9k+16=14-19+k
-2k+16=-5+k
21=3k
k=7

2007-10-06 03:07:04 補充:
嘩, 原來好多人都唔識拆括號-(a-b) = -a+b請大家小心
2007-10-05 3:56 am
7k-(9k-16)=14-(19-k)
7k-9k-16=14-19-k
-16-14+19= -k-7k+9k
k=11
2007-10-05 3:48 am
7k-(9k-16)=14-(19-k)
7k-9k-16=14-19-k
-2k-16=-5-k
-2k=-5-k+16
-2k+k=-5+16
-k=11


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