MATHS

2007-01-11 2:29 am
16n-7n+9=90

回答 (4)

2007-01-11 2:37 am
16n-7n+9=90
16n-7n+9-9=90-9 16n-7n=81 9n=81 9n/9=81/9 n=9
2007-01-11 2:33 am
16n-7n+9=90
9n+9=90
9n-9=90-9
9n=81
n=9
easy
參考: me
2007-01-11 2:32 am
16n-7n+9=90
9n=81
n=9
2007-01-11 2:32 am
9n=90-9
9n=81
n=81/9
n=9


收錄日期: 2021-04-12 22:02:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070110000051KK02994

檢視 Wayback Machine 備份