Solve problems by using simple equations...(即係有x果d equations...)
Question: In a supermarket, the price of an apple is $2.5, and an orange is $3. Alan got $2 left afer buying some apples. However, he would need $2 more if he wanted to buy the same number of oranges. Find the number of apples he bought.
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Form one Maths....唔該help下我......
2006-11-18 4:42 am
回答 (4)
2006-11-18 5:09 am
✔ 最佳答案
Let a be the number of apples he bought2.5a+2 = 3a-2
4 = 0.5a
a = 8
therefore, he bought 8 apples.
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首先，佢話佢買咗a個值$2.5既apples後，剩咗$2 ；然後，佢買相同數目(a個)既oranges，而每個orange值$3，但係佢要多$2先買到a個。
所以，「2.5a+2」就係用apples去計佢既錢，而「3a-2」就係用oranges 去計佢既錢，因此佢地加上=就係條式啦!!!
參考: me
2006-11-18 4:20 pm
Let a be the number of apples he bought
2.5a+2 = 3a-2
4 = 0.5a
a = 8
therefore, he bought 8 apples.
2.5a+2 = 3a-2
4 = 0.5a
a = 8
therefore, he bought 8 apples.
2006-11-18 4:57 am
A x 2.5 + 2 = M
(M + 2) = A x 3
M = 3A -2
2.5A + 2 = 3A - 2
4 = 0.5A
A = 8
A = no. of apple = 8
M = my money HK$22
After buying 8 apples, HK$2 left
If I ewant to buy 8 oranges, HK$24 is needed, so I need HK$2 in additional to the original money HK$22
(M + 2) = A x 3
M = 3A -2
2.5A + 2 = 3A - 2
4 = 0.5A
A = 8
A = no. of apple = 8
M = my money HK$22
After buying 8 apples, HK$2 left
If I ewant to buy 8 oranges, HK$24 is needed, so I need HK$2 in additional to the original money HK$22
2006-11-18 4:48 am
let the amount of apple Alan bought is x
and the money Alan originally got is y
For apples we have the equation: y-2.5x=2==>y=2.5x+2
For oranges we have the equation y-3x=0===>y=3x
combine the two equation
2.5x+2=3x
2=0.5x
x=4
Therefore the amount of apple Alan bought is 4
and the money Alan originally got is y
For apples we have the equation: y-2.5x=2==>y=2.5x+2
For oranges we have the equation y-3x=0===>y=3x
combine the two equation
2.5x+2=3x
2=0.5x
x=4
Therefore the amount of apple Alan bought is 4
收錄日期: 2021-04-13 00:46:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061117000051KK03851