初中數求教列式
回答 (2)
2008-07-05 11:50 pm
✔ 最佳答案
設來價是x。x(1+25%)(85%) = x+300
x(125%)(85%) = x+300
x(1.25)(0.85) = x+300
x(1.0625) = x+300
1.0625x = x+300
1.0625x-x = 300
x(1.0625-1) = 300
x(0.0625) = 300
x = 4800
來價是4800元~
參考: 自己
2008-07-05 11:45 pm
設來價為x，
x - x(1+25%)(85%) = 300
x - x(1+25%)(85%) = 300
收錄日期: 2021-04-13 15:46:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080705000051KK01533