教我計兩條方程式pls(要步驟唔該)
Q1.3x+3(2x)=72
上面呢個唔識做步驟
Q2.Mrs.Chan pays $100 for a bag of rice and a bottle of corn oil,and receives a change of $25.It is know that he price of a bag of rice is 2 times that of a bottle of corn oil. what are the respective prices of a bag of rice and a bottle of corn oil?
點列式呀
低B數學(但唔識做)~Basic Algebra
2007-10-09 7:07 am
回答 (2)
2007-10-09 7:13 am
✔ 最佳答案
Q.13x + 3(2x) = 72
3x + 6x = 72
9x = 72
x = 8
Q.2
Net Pay = $100 - $25 = $75
Let x be the price of a bag of rice
x + 0.5x = 75
1.5x = 75
x = 50
The prices of a bag of rice is $50 and a bottle of corn oil is $75 - $50 = $25.
2007-10-09 7:12 am
Q1.3x+3(2x)=72
3x + 3(2x) = 72
3x + 6x = 72
9x = 72
x = 8
Q2.Mrs.Chan pays $100 for a bag of rice and a bottle of corn oil,and receives a change of $25.It is know that he price of a bag of rice is 2 times that of a bottle of corn oil. what are the respective prices of a bag of rice and a bottle of corn oil?
點列式呀
price of a bottle of corn oil = x
price of a bag of rice = 2x
x + 2x = 100 - 25
3x = 75
x = 25
price of a bottle of corn oil = $ 25
price of a bag of rice = $ 50
3x + 3(2x) = 72
3x + 6x = 72
9x = 72
x = 8
Q2.Mrs.Chan pays $100 for a bag of rice and a bottle of corn oil,and receives a change of $25.It is know that he price of a bag of rice is 2 times that of a bottle of corn oil. what are the respective prices of a bag of rice and a bottle of corn oil?
點列式呀
price of a bottle of corn oil = x
price of a bag of rice = 2x
x + 2x = 100 - 25
3x = 75
x = 25
price of a bottle of corn oil = $ 25
price of a bag of rice = $ 50
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