中一數學方程 - Ans.fyi 參考答案

中一數學方程

2013-08-09 9:25 pm

1.The prices of a pack of potato chips and a bar of chocolates are ＄y and ＄17 respectively. Michael paid ＄44 for 3 packs of potato chips and a bar of chocolates . Set up an equation in y to describe.

2.Amy bought 4 packs of biscuits in a shop . If she paid ＄100 and the change is ＄16,find the selling price of a packs of biscuits .

3.A rectangle is 6 cm long.If the perimeter of the rectangle is 28 cm , find the width of the rectangle .

求快解,急用

回答 (1)

micatkie

2013-08-09 9:39 pm

✔ 最佳答案

1.
The price for 3 packs of potato chips = $3y
The price for a bar of chocolates = $17

The amount to pay (in $):
3y + 17 = 44

=====
2.
Let $y be the selling price of a pack of biscuits.

The amount to pay (in $) :
4y = 100 - 16
4y = 84
y = 21

The selling price of a pack of biscuits = $21

=====
3.
Let w cm be the width of the rectangle.

The perimeter (in cm) :
2 x (6 + w) = 28
6 + w = 14
w = 8

The width of the rectangle = 8 cm

2013-08-09 13:40:35 補充：
To solve the equation in Q.1 :
3y + 17 = 44
3y = 27
y = 9

參考: micatkie, micatkie

👍 0 👎 0