Each apple costs $m and each orange costs $n. Peter buys 3apples and 4 oranges and pays $20. How much change should be given?
每個蘋果值$m，每個橙值$n。現彼得買蘋果3個，橙4個，付$20，應找回多少?
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有條數學題唔識牙
2009-07-31 11:32 pm
回答 (2)
2009-08-01 12:30 am
唔會計到答案，因為唔知m同n嘅值
$20-$(3m)-$(4n)
$20-$(3m)-$(4n)
收錄日期: 2021-04-15 21:42:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090731000051KK01161