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
連比例式應用 ''要算式''急急急~20點!!!
May 4th 2013, 04:57

你好^^
以下給你參考一下:)

(1)
設甲為X,乙為Y,丙為Z
X-50:Y-50:Z-50=2:3:4
已知甲剩下24元
所以X-50:Y-50:Z-50=2:3:4=24:36:48
X-50=24
X=74
Y-50=36
Y=86
Z-50=48
Z=98

(2)
因為M、N分別為為AB線、CD線的中點
所以MN線=1/2AB線+BC線+1/2CD線=16
已知AB線:BC線:CD線=6:3:4=6K:3K:4K
所以6K/2+3K+4K/2=8K=16
K=2
AD線=AB線+BC線+CD線=6K+3K+4K=13K=26

(3)
已知(X+Y):(Y+Z):(Z+X)=7:12:9=7K:12K:9K
X+Y=7K
Y+Z=12K
Z+X=9K
三式相加
2(X+Y+Z)=28K
X+Y+Z=14K=280-------(1)
K=20
因此
X+Y=7K=140----------(2)
Y+Z=12K=240---------(3)
Z+X=9K=180----------(4)
(1)-(2)
Z=140
(1)-(3)
X=40
(1)-(4)
Y=100

希望有幫到你^^
不理解的地方可以再發問唷^^

參考資料 自己唷^^

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: Thatcher's Tyrants - The Tanks, The Guns, The Christmas Cards.

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

    newspoku 發表在 痞客邦 留言(0) 人氣()