F.1數學........增加百分數

a
(170-100)
-------------- x 100%
100
= 70%

b
(91-70)
---------- x 100%
70
= 30%

c
12
---- x100%
24
= 50%

d
15
---- x100%
75
= 20%

2006-12-05 22:50:01 補充：
a100*(1 20%)=120b170*(1 40%)=238c70*(1 7%)=74.9d64*(1 25%)=80

by them

1a. 170-100/100 *100

= 70/100 *100

= 70%

b.$91 - $70 /$91 *100

= 21/91 *100

= 23.08%

c.24 -12 /24 *100
= 12/24 *100
=50%

a. $100 x (1 +20%)
= $102

b.170L x (1+ 40%)
L = 176.8

c.70hr x (1+ 7%)
= 74.9hr

d.64x (1+25%)
=80

在下列各題中,求增加百分數
a. (170-100)/100 X 100% = 70%
b. (91-70)/70 X 100% = 30 %
c. 12/24 X 100% = 50 %
d. 15/75 X 100% = 20 %

按以下括號裹所述的百分數把所給的量增加:
a. 100 + 100 X 20 % = $120
b. 170 + 170 X 40 % = 238L
c. 70 + 70 X 7 % = 74.9 小時
d. 64 + 64 X 25 % = 80 kg

(新數-舊數)/舊數<--將呢個答案x100
得出既答案就係佢改變既%
如果題目問你增加左幾多,就答呢個答案
但係如果題目係問你,改變後的數字是原來的數字的幾多%
那就要將上面的答案+100
如答案係20%,就要黎120%
因為其中100%=100/100
=1 係代表佢本身個數,之後淨番果20/100就係增加左既%