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回答 (2)
2010-02-27 7:14 pm
✔ 最佳答案
2x + 4(100-x) = 2802x+400-4x=280
2x-4x=280-400
-2x=-120
x=-120/-2
x=60
Check
2x+4(100-x)
=2(60)+4(100-60)
=120+400-240
=520-240
=280 Right
I hope this can help you
參考: Me
收錄日期: 2021-04-19 21:22:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100218000051KK01565