20 x (1+r%) =26, find r .
30 x (1-r%) =28.2, find r.
(Don't only answer)
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2條S1數學題
2008-08-20 2:24 am
回答 (2)
2008-08-20 2:28 am
✔ 最佳答案
20 x (1+r%) =2620+20r%=26
20r%=6
r%=3/10
r=30
30 x (1-r%) =28.2
30-30r%=28.2
30r%=1.8
r%=3/50
r=6
參考: 自己
2008-08-20 3:02 am
1)
20 x (1+r%) =26
20/20 x (1+r/100)=26/20
1+r/100=1.3
r/100=0.3
r=30
2)
30 x (1-r%) =28.2
30/30 x (1-r/100)=28.2/30
1-r/100=0.94
1-0.94=r/100
r/100=0.06
r=6
20 x (1+r%) =26
20/20 x (1+r/100)=26/20
1+r/100=1.3
r/100=0.3
r=30
2)
30 x (1-r%) =28.2
30/30 x (1-r/100)=28.2/30
1-r/100=0.94
1-0.94=r/100
r/100=0.06
r=6
參考: me
收錄日期: 2021-04-23 22:50:22
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https://hk.answers.yahoo.com/question/index?qid=20080819000051KK02368