更新1:
唔明???
數學題-買5個足球和3個籃球.....
回答 (2)
2009-03-14 11:01 am
✔ 最佳答案
買5個足球和3個籃球共要580元買3個足球和5個籃球共要540元
買5+3個足球和3+5個籃球共要580+540元
買8個足球和8個籃球共要1120元
買1個足球和1個籃球共要
1120 8 = 140元
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2009-03-14 03:02:07 補充：
1120 ÷ 8 = 140元
2009-03-14 4:39 am
let x be price of football
y be the price of basketball
5x +3y = 580 ---(1)
3x +5y = 540 ---(2)
(1)X3-(2)X5 :
9y-25y=-960
y=60
then x = 80
hence the price of football is 80
the price of basketball is 60
y be the price of basketball
5x +3y = 580 ---(1)
3x +5y = 540 ---(2)
(1)X3-(2)X5 :
9y-25y=-960
y=60
then x = 80
hence the price of football is 80
the price of basketball is 60
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090313000051KK01528