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1.六個月前志明重56kg,如果他現在比當時重37kg,求他體重增加的百分數?
2.如果一間學校去年的學生人數是1300,今年是1404,該校學生人數增加的百分數是多少?
3.一住宅單位的面積是55 ㎡,而飯廳的面積是22 ㎡.飯廳的面積佔全個單位面積的百分之幾?
4.某中一級的學生人數為180人,其中108人坐校巴上學,有百分之幾的中一級的學生坐校巴上學?
5.一個農夫從田裹採摘了1600個西瓜.如果其中有7 1/2%是壞的,他採摘的西瓜有多少個是好的?
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求下列各題的未知數:
1. 830 km是N km的20%
2. $192是$P 的75%
3.132 g是T g的88%
4.562.5 mL是K mL的150%
F.1數學........增加百分數
2006-12-07 6:00 am
回答 (2)
2006-12-07 8:15 pm
✔ 最佳答案
條式應該係咁:新嗰個數 - 舊嗰個數
----------------------------- x 100%
.........舊嗰個數
(正數即係增加, 負數即係下降)
1) 他體重增加的百分數是:
(37/56) x100%
= 0.6607(大約) x 100%
= 66.07%
2) 學生人數增加的百分數是:
[(1404 -1300)/1300) x 100%
0.08 x 100%
= 8%
3)飯廳的面積佔全個單位面積的:
(22/55) x 100%
= 0.4 X 100%
= 40%
4) 中一級的學生坐校巴上學的百分數是:
(108/180) x 100%
=0.6 x 100%
= 60%
5) 他採摘的西瓜, 好的有:
1600 x (100% - 7.5%)
= 1600 x 92.5%
= 1600 x 0.925
= 1480個
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1.
830/N = 20%
830 = N x 20% = N x 0.2
N = 830/0.2
N = 4150
2.
192/P = 75%
192 = P x 75% = P x 0.75
P = 192/0.75
P = 256
3.
132/T = 88%
132 = T x 88% = T x 0.88
T = 132/0.88
T = 150
4.
562.5/K = 150%
562.5 = K x 150% = K x 1.5
K = 562.5/1.5
K = 375
希望幫到你~!!
2006-12-07 6:37 am
1.
56 + 37= 93(kg)
37/93 x100% =39.7%(約等於)
2.
1404 - 1300 = 104(人)
104/1300 x 100% = 8%
3.
22/55 x 100% = 40%
4.
108/180 x 100% = 60%
5.
100% - 7.5% = 92.5%
1600 x 92.5% = 1480(個)
求下列各題的未知數:
1.
830 =N ‧20%
N = 4150
2.
192 = P‧75%
P = 256
3.
132 =T‧88%
T = 150
4.
562.5 = K‧150%
K = 374.8
56 + 37= 93(kg)
37/93 x100% =39.7%(約等於)
2.
1404 - 1300 = 104(人)
104/1300 x 100% = 8%
3.
22/55 x 100% = 40%
4.
108/180 x 100% = 60%
5.
100% - 7.5% = 92.5%
1600 x 92.5% = 1480(個)
求下列各題的未知數:
1.
830 =N ‧20%
N = 4150
2.
192 = P‧75%
P = 256
3.
132 =T‧88%
T = 150
4.
562.5 = K‧150%
K = 374.8
收錄日期: 2021-04-29 21:52:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061206000051KK04639