數學題三條

1. y x (1-85%) = 6 答案: 40
2. y x (1-80%) = 40 答案: 200
3. y x 80% = 60 答案: 75

1.定價
=6/0.15 -6
=34

2.定價
=40/0.2 -40
=160

3.原價
=60/0.2
=300

1. y x (1-85%) = 6 答案: 40
2. y x (1-80%) = 40 答案: 200
3. y x 80% = 60 答案: 75

1.八五折買手套一對，便宜了6元。手套每對定價多少元?
6/(1-85%)=40

2.座地燈以八折出售，節省了40元，問座地燈定價是多少?
40/(1-80%)=200

3.玩具車八折出售，售價60元，問原價是多少元?
60/80%=75