點計12-(7-4x)=25?

2010-10-26 6:37 am

我錯左d咩?
12-(7-4x)=25
(7-4x)=25+12
7-4x=37
4x=37+7
4x/4=44/4
x=11

回答 (6)

2010-10-27 2:25 am

12-(7-4x)=25

12-7+4x=25

5+4x=25

4x=20

x=5

👍 0 👎 0

2010-10-26 6:55 am

12-(7-4x)=25
5+4x=25
4x=20
x=5

參考: 自己

👍 0 👎 0

2010-10-26 6:49 am

the correct answer:
12-(7-4x)=25
12-7+4x=25
5+4x=25
4x=20
x=5

👍 0 👎 0

2010-10-26 6:46 am

5-4x=25
4x=20
x=5

以上係我心算,...即興咋.....

(step2嗰度RHS唔可以係''+12'',要係''-12'',因為LHS12係正數所以轉去RHS會變為負數,即減12,之後你應該ok嘅!加油la:)

參考: me

👍 0 👎 0

2010-10-26 6:43 am

4x=37+7

這步錯了

👍 0 👎 0

2010-10-26 6:42 am

It should be :

12-(7-4x) = 25

-(7-4x) = 25-12
-7+4x = 13
4x = 13+7
4x = 20
x = 20/4
x=5

👍 0 👎 0