close
Blogtrottr
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
國中數學 (函數 不等式) 各校菁華試題
Jun 25th 2013, 14:55

1.
設加入 m 公克的食鹽。

混合食鹽水濃度
= [(m + 1360 x 10%) / (m + 1360)] x 100%
= (100m + 13600)% / (m + 1360)

(100m + 13600)% / (m + 1360) > 15% (100m +13600)% / (m + 1360) < 20%
100m + 13600 > 15m + 20400
100m +13600 < 20m + 27200
85m > 6800
80m < 13600
m > 80
m < 170
所以 80 < m < 170

須加入食鹽多於 80 公克而少於 170 公克

2.
f(x) = mx+ c ...... [1]

x 的值減少 2f(x) 的值增加 10 :
f(x) + 10 = m(x - 2) + c
f(x) = mx + c - (2m + 10) ...... [2]

[1] = [2] :
mx + c = mx + c - (2m + 10)
2m + 10 = 0
m = -5
所以 f(x) = -5x + c

f(-1) = 11
-5(-1) + c = 11
c = 6
所以 f(x) = -5x + 6

f(10)
= -5(10) + 6
= -44

3.
最臨界的情況,是票數平均分佈在五位候選人。每人得票
= 80000 ÷ 5

= 16000

只要多取一票,便可確定當選。
故此,確定當選的票數
= 16000 + 1

=
16001

4.
設每本書的成本為 c 元。

{[1 + (1/4)]c - 10} - c ≥ c x 5%
(1.25c - 10) - c ≥ 0.05c
0.20c ≥ 10
c ≥ 50

每本書的成本至少為 50

參考資料 賣女孩的火柴

This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers. Five Filters recommends: 'You Say What You Like, Because They Like What You Say' - http://www.medialens.org/index.php/alerts/alert-archive/alerts-2013/731-you-say-what-you-like-because-they-like-what-you-say.html

You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions
arrow
arrow
    全站熱搜
    創作者介紹
    創作者 omoss 的頭像
    omoss

    中視聶小倩線上看 , 聶小倩線上看第二集 , 聶小倩 中視 , 聶小倩電視劇 , 聶小倩

    omoss 發表在 痞客邦 留言(0) 人氣()