數學題.快d教我//
2007-11-30 7:32 pm
The average temperature onTuesday is20%,or 6度,lower than that on Monday.What is the average temperature on Monday?
回答 (4)
2007-11-30 7:38 pm
✔ 最佳答案
Let x degree Celcius be the temperature on Monday.Then x ( 1- 20%) = x - 6
0.8 x = x - 6
x = 30
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2007-11-30 7:46 pm
Let the average temperature on Monday be y.
the average temperature on Tuesday: y-6℃
and also is 20% lower than that on Monday. [y(1-20%)]
So, the equation is :
y-6=y(1-20%)
y-6=0.8y
y=30
2007-11-30 11:49:37 補充：
Tuesday: 24℃Monday: 30℃
the average temperature on Tuesday: y-6℃
and also is 20% lower than that on Monday. [y(1-20%)]
So, the equation is :
y-6=y(1-20%)
y-6=0.8y
y=30
2007-11-30 11:49:37 補充：
Tuesday: 24℃Monday: 30℃
2007-11-30 7:44 pm
Assume x is the average temperature on Monday
x(1-20%)=x-6
0.8x=x-6
0.2x=6
x=30
so, the average temperature on Monday is 30, Tuesday is 24.
x(1-20%)=x-6
0.8x=x-6
0.2x=6
x=30
so, the average temperature on Monday is 30, Tuesday is 24.
2007-11-30 7:41 pm
Let T = temperature on Monday
T(20%) = 6
T = 6/(20%)
= 30 degree
Temperature on Monday = 30 degree
T(20%) = 6
T = 6/(20%)
= 30 degree
Temperature on Monday = 30 degree
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071130000051KK00847