牛仔褲原價400元,減價120元.............

售價是:
400-120
=280(元)

售價是原價的百分之幾?
120
--------x100%
480

=4x100%

=25%

減價百分之幾?
100%-25%

=75%

a) $280
b) 70%
c) 30%

(a)售價是多少元?
$400-$120=280元

(b)售價是原價的百分之幾?
(400-280)/400 x 100%=70%

(c)減價百分之幾?
100% - 70% =30%

售價:400-120=280
售價是原價的百分之幾:280/400*100%=70%(百分之70)
減價百分之幾:100%-70%=30%(百分之30)

(a) 400-120=280
----------------------------------------------------
280
(b) ________*100%=70%
400
----------------------------------------------------
120
(c) ______*100%=30%
400

(a)售價是多少元?
$400 - $120 = $280

(b)售價是原價的百分之幾?
$280/$400*100% = 70%

(c)減價百分之幾?
100%-70% = 30%

(a)400-120=280元

(b)120/400 x100%=30%

(c)400-120/400 x100%=70%

(a)售價是多少元?
$400 - $120 = $280

(b)售價是原價的百分之幾?
$280/$400 = 70%

(c)減價百分之幾?
100%-70% = 30%

a) $280
b) 70%
c) 30%

如下......

2006-11-23 18:14:47 補充：
a:280元b:百分之70c:7折

2006-11-23 18:17:20 補充：
1.400-120=280$2:120/400×100 ％=70 ％3:280/400×100％=7折希望幫到你la