數學問題（代數一題）急！...

2010-10-27 6:47 pm

五分之三個f加1等於十分之五加f

答案是等於-1

我不知道過程

thx.

回答 (4)

2010-10-28 2:23 am

✔ 最佳答案

(3f/5)+1=(5+f)/10
3f/5+5/5=(5+f)/10
(3f+5)/5=(5+f)/10
10(3f+5)=5(5+f)
30f+50=25+5f
30f-5f=25-50
25f=-25
f=-25/25
f=-1

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2010-11-01 3:25 am

3f+1 / 5= 5+f / 10
30f +10 = 25 + 5f
25f = 15
f = 3/5

參考: i am teacher

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2010-10-31 12:00 am

3/5f+1=5/10+f
3/5f-f=5/10-1
-2/5f=-0.5
f=1.25

f不是=-1,係=1.25

2010-10-30 16:10:56 補充：
ME!!!(JK)

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2010-10-27 9:33 pm

3f / 5 + 1 = (5+f)/10
10*3f/5 + 10*1 = 10*(5+f)/10
6f + 10 = 5+f
6f - f = 5 -10
5f = -5
f = -5 / 5
f = -1

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