標題:
英數MC題!!!!!(緊急!!!只限今日!!!!!)-----20分------
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發問:
1. Find the percentage increase in each of the following. a An increase from 100 to 170. b An increase from 70 to 91. c An increase of $12 from $24. d An increase of 15 kg from 75 kg.2. Find the percentage decrease in each of the following. a A decrease from 100 to 65. b A... 顯示更多 1. Find the percentage increase in each of the following. a An increase from 100 to 170. b An increase from 70 to 91. c An increase of $12 from $24. d An increase of 15 kg from 75 kg. 2. Find the percentage decrease in each of the following. a A decrease from 100 to 65. b A decrease from 70 to 35. c A reduction of 35 kg from 140 kg. d A reduction of $2 500 from $12 500. 更新: Complete the following table. Original value New value Percentage change a 500 600 +20% b $2 $1.5 ? c 88cm 99cm ? d 285 C(度) 330.6 C(度) ? e 60 kg 56.4 kg ? 更新 2: 7. Dick weighed 56 kg six months ago.If he is now 7 kg heavier,find the percentage increase in his weight. 8. If the number of students in a school was 1 300 last year and is 1 404 this year,what is the percentage increase in the number of students? 更新 3: 9. The price of a pair of shoes is $580.If the price decreases by $87,what is the percentage decrease in price? 更新 4: 一定要有過程,,唔可以無過程,,唔可以得答案!!! 只根今日,,答得好嗰個即刻有20分!!! 更新 5: 好啦~~ 我會等阿sir cherk咗之後,睇下邊個係啱既~~ 邊個就會有20分~~~ 有無問題?? 贊唔贊成呀??
最佳解答:
1) a) (170 - 100)/100 = 70% b) (91 - 70)/70 = 30% c) 12/24 = 50% d) 15/75 = 20% 2) a) (100 - 65)/100 = 35% b) (70 - 35)/70 = 50% c) 35/140 = 25% d) 2500/12500 = 20% Table (Orignal, New, % change): a) 500, 600, +20% (given) b) $2, $1.5, -25% c) 88cm, 99cm, +12.5% d) 285 C(度), 330.6 C(度), +16% e) 60 kg, 56.4 kg, -6% 7) 7/56 = 12.5% 8) (1404 - 1300)/1300 = 8% 9) 8.7/580 = 1.5% 2006-11-21 18:44:41 補充： 9) 87/580 = 15%
其他解答:
自己做啦 ~~ 如此簡單的問題 ~~ 唔好咁樣問答案啦 ~~ 最尾你都係唔識 ~~ 考試點算 ... 係咪 ?!?!|||||1a.%↑=(170-100)/100x100%=70% b..%↑=(91-70)/70x100%=30% c..%↑=(24-12)/12x100%=100% d..%↑=(75-15)/15x100%=400% 2a.%↓=(100-65)/100x100%=35% b..%↓=(70-35)/70x100%=50% c..%↓=(140-35)/140x100%=75% table: b.%△=(1.5-2)/2x100%=-25% c.%△=(99-88)/88x100%=25/4% d.%△=(330.6-285)/285x100%=16% e.%△=(56.4-60)/60x100%=-6% 7.%↑=(56+7-56)/56x100%=25/4% 8.%↑=(1404-1300)/1300x100%=8% 9.%↓=(580-(580-87))/580x100%=15%|||||1a.(170-100)除100乘100% = 70 % 1b.(91-70)除70乘100% = 30% 1c.12除24乘100% = 50% 1d 15除75乘100% = 20% 2a. (100-65)除100乘100% = 35% 2b. (70-35)除70乘100% = 50% 2c. 35除140乘100% =25% 2d. 2500除12500乘100% =20% a. 500600 + 500600乘20% =600720 b.(2-1.5)除2乘100% = 25% decreased c.(99-88)除88乘100% = 12.5% increased d. (330.6 - 285)除285乘100% = 16% increased e. (60-56.4)除60乘100% = 6% decreased 7. (63-56) 除56 乘100% = 12.5% increased 8. (1404-1300)除1300乘100% = 8% increased 9. 87除580乘100% = 15%decreased
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