3
--- a - 20 + 50 = a
4
長細部就..;
數學....
2007-09-08 2:28 am
回答 (3)
2007-09-08 2:32 am
✔ 最佳答案
3a/4 - 20 + 50 = a3a/4 + 30 = a
3a/4 + 30 - 3a/4 = a - 3a/4
30 = a/4
4 x 30 = 4 x a/4
120 = a
a = 120
2007-09-08 2:51 am
(3/4)a - 20 50 = a
(3/4)a 30 = a
30 = (1 - 3/4)a
30 = (1/4)a
a = 120
(3/4)a 30 = a
30 = (1 - 3/4)a
30 = (1/4)a
a = 120
2007-09-08 2:36 am
3
--- a - 20 + 50 = a
4
3
- 20 + 50 = a - --- a
4
1
30 = --- a
4
a = 120
2007-09-07 18:39:11 補充：
(3/4)a - 20 50 = a (3/4)a 30 = a 30 = (1 - 3/4)a 30 = (1/4)a a = 120
--- a - 20 + 50 = a
4
3
- 20 + 50 = a - --- a
4
1
30 = --- a
4
a = 120
2007-09-07 18:39:11 補充：
(3/4)a - 20 50 = a (3/4)a 30 = a 30 = (1 - 3/4)a 30 = (1/4)a a = 120
參考: me
收錄日期: 2021-05-03 11:38:01
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https://hk.answers.yahoo.com/question/index?qid=20070907000051KK02435