各位知識朋友 , 入黎幫我手 ar !!!
我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!! (要步驟)
1.Solve the following equations :
(a) 22 - 3x = -8x - 8
(b) - 25/4 = 5/-2x
2.Two lifts A and B start at the same floor.Lift A goes up 5 floors,while lift B goes down 4 floors.How many floors are they apart now.
<40 marks> 各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (60)
2008-07-17 12:44 am
回答 (3)
2008-07-17 12:54 am
✔ 最佳答案
1(a) 22-3x = -8x-8 (先把x的搬到右手邊, 把數字搬到左手邊)
-3x + 8x = -8 -22
5x = -30
x = -6
(b) -25/4 = 5/-2x
x = -5/2 * -4/25
x = 2/5
2. They are apart:
5-(-4) = 9 floors
參考: 自己
2008-07-17 2:29 am
(a) 22 - 3x = -8x - 8
5x = -30
x = -6
(b) - 25/4 = 5/-2x
50x = 20
x = 2/5
2 . 5-(-4) = 9
5x = -30
x = -6
(b) - 25/4 = 5/-2x
50x = 20
x = 2/5
2 . 5-(-4) = 9
2008-07-17 12:53 am
1A -3x + 8x = -8 - 22
5x = -30
x = -6
1B - 25/4 = 5/-2x
(-25)(-2x) = (5)(4)
50x = 20
x = 5/2
2. 5+4=9
5x = -30
x = -6
1B - 25/4 = 5/-2x
(-25)(-2x) = (5)(4)
50x = 20
x = 5/2
2. 5+4=9
收錄日期: 2021-04-25 23:17:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080716000051KK01889