標題:
F5 Maths
發問:
最佳解答:
New price for each = $ (54+10) / (N-2) Old price for each = $ 54/NSo(54+10)/(N-2) - 54/N = 164N - 54(N-2) = N(N-2)10N + 108 = N^2 - 2NN^2 - 12N - 108 = 0(N - 18)(N + 6) = 0N = 18 or N = - 6 (rejected)
其他解答:
$54 for N stickers, so, $54 / N for a sticker If, each sticker increased $1, the price is $(54 / N + 1) and pay $(54 + 10) = $64 So, (54 / N + 1)(N - 2) = 64 54 + N - 108 / N - 2 = 64 N - 108 / N - 12 = 0 N^2 - 12N - 108 = 0 (N - 18)(N + 6) = 0 N = 18 or -6(rej.) So, the value of N is 18 2010-09-05 16:28:42 補充： F5 maths?? I don't think so......... just S3~S4
F5 Maths
發問:
此文章來自奇摩知識+如有不便請留言告知
Mabel pays $54 for N stickers. If the price of each sticker is increased by $1, she can only buy (N-2) stickers by paying $10 more. Find the value of N.最佳解答:
New price for each = $ (54+10) / (N-2) Old price for each = $ 54/NSo(54+10)/(N-2) - 54/N = 164N - 54(N-2) = N(N-2)10N + 108 = N^2 - 2NN^2 - 12N - 108 = 0(N - 18)(N + 6) = 0N = 18 or N = - 6 (rejected)
其他解答:
$54 for N stickers, so, $54 / N for a sticker If, each sticker increased $1, the price is $(54 / N + 1) and pay $(54 + 10) = $64 So, (54 / N + 1)(N - 2) = 64 54 + N - 108 / N - 2 = 64 N - 108 / N - 12 = 0 N^2 - 12N - 108 = 0 (N - 18)(N + 6) = 0 N = 18 or -6(rej.) So, the value of N is 18 2010-09-05 16:28:42 補充： F5 maths?? I don't think so......... just S3~S4
文章標籤
全站熱搜
留言列表
