以下嘅問題請寫出步驟,答案,最好寫埋解釋!!!
1.Divide the sum of 6 and twice the number X by 3 is equal to 6.
Find X.
2.Andy spent $82 on buying some mangoes at $4.5 each and X
oranges at$2.5 each.He bought 20 mangoes and oranges altogether.
Find X.
3.Nancy is twice as old as Peter.After eight years,the sum of their age s will be 94.How old is Nancy now?
F.1 Maths!高手請入!急!急!急!
2008-12-30 9:19 am
回答 (3)
2008-12-30 10:11 pm
✔ 最佳答案
for the question2:question says 20 in total, so there's nothing wrong with it, and the solutions for that is showed as below:
let x be the mangoes, and y be the oranges:
4.5x+2.5y=82
and
x+y=20
so X=20-y,
and 4.5(20-y)+2.5y=82
so y=6, and x=14.
thanks.
2008-12-31 2:33 am
karen_yingfeng:
對！我諗２０是指 mangoes ＋ oranges的總數，而不是單單指mangoes的數量
對！我諗２０是指 mangoes ＋ oranges的總數，而不是單單指mangoes的數量
2008-12-30 10:02 am
1.(2x+6)/3=6
2X+6=18
2x=12
X=6
2.你呢條係唔係錯架?ANDY 用82蚊買左20個芒果同x個橙，但係每個芒果就4.5，咁20個芒果就90蚊，咁咪大過82蚊……咁唔合理喎，你睇清楚條題目先。
3.SET NANCY IS x
SET PETER IS Y
i) 2Y=X
ii)(Y+8)+(X+8)=94
PUT i INTO ii
(Y+8)+(2Y+8)=94
3Y+16=94
Y=26
PUT Y=26 INTO i
2(26)=X
X=52
SO Nancy is 52 years old
2X+6=18
2x=12
X=6
2.你呢條係唔係錯架?ANDY 用82蚊買左20個芒果同x個橙，但係每個芒果就4.5，咁20個芒果就90蚊，咁咪大過82蚊……咁唔合理喎，你睇清楚條題目先。
3.SET NANCY IS x
SET PETER IS Y
i) 2Y=X
ii)(Y+8)+(X+8)=94
PUT i INTO ii
(Y+8)+(2Y+8)=94
3Y+16=94
Y=26
PUT Y=26 INTO i
2(26)=X
X=52
SO Nancy is 52 years old
收錄日期: 2021-04-15 18:32:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081230000051KK00162