7x-9>9x+7
請求x是多少?
代數難題 (真是很難)
2009-07-30 10:32 pm
回答 (3)
2009-07-30 10:40 pm
✔ 最佳答案
7x-9>9x+7-9-7>9x-7x
-16>2x
-8>x
x細過-8
即-9,-10......
2009-07-31 2:20 am
7x-9>9x+7
7x-7x-9>9x-7x-7
-9>2x-7
-9+7>2x-7+7
-2>2x
-1>x
x= (-2) - (-n)
7x-7x-9>9x-7x-7
-9>2x-7
-9+7>2x-7+7
-2>2x
-1>x
x= (-2) - (-n)
2009-07-30 10:44 pm
7x-9 >9x+7
7x-9x>7+9
- 2x >16
x<- 8
7x-9x>7+9
- 2x >16
x<- 8
收錄日期: 2021-05-02 17:22:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090730000051KK01033