9.The length of a piece of cloth shrinks by 10% after washing.How long should Jane buy if she wants to have 1.8m of cloth after washing?
11.A is 20% more than B ,what percentage of A is B.
maths解釋&答
2006-11-08 5:06 am
回答 (3)
2006-11-08 5:23 am
✔ 最佳答案
9. 設x係布既長度x(1-10%)=1.8 因為布會縮水10%,我地要縮水後都要有1.8m既長度
0.9x=1.8
x=2
所以原本既布要有2m先可以達到要求
11. A=B(1+20%) 因為A長過B 20%
咁求返B係即係A既幾多%
就即係話求返B=幾多A
咁即係A/(1+20%)=B
A/1.2=B
10A/12=B
8 1/3 A = B
(83 1/3%)A=B
所以B係(83 1/3%)A or 83.33%
參考: 自己
2006-11-08 5:17 am
9. Let x m be the length of cloth
(1-10%)x= 1.8
x=2
so Jane should but a 2m cloth.
11. A= (1+20%)B
B=1/1.2 A
'what percentage of A is B'唔係好明你衣句想講咩
(1-10%)x= 1.8
x=2
so Jane should but a 2m cloth.
11. A= (1+20%)B
B=1/1.2 A
'what percentage of A is B'唔係好明你衣句想講咩
參考: me
2006-11-08 5:13 am
9. Let x be the length of cloth that Jane should buy.
x * ( 90 % ) = 1.8 m
x = 1.8 / 90 %
x = 2 m
11. B = 1.2 A
The percentage of A from B
= B / A * 100 %
= 1.2A / A * 100%
= 120%
x * ( 90 % ) = 1.8 m
x = 1.8 / 90 %
x = 2 m
11. B = 1.2 A
The percentage of A from B
= B / A * 100 %
= 1.2A / A * 100%
= 120%
收錄日期: 2021-04-12 22:31:15
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