F.1 maths 方程~ help!!

2013-10-13 5:14 am
唔該大家清楚咁列步驟,我唔識,希望大家可以教下我點解咁做條方程等我明白!! plz!!

1. 15-6(3-2p)/9=1

2. 3/4-5-3q/12=2/3

3. 1/5-4q-1/10=3/20

回答 (2)

2013-10-13 5:39 am
✔ 最佳答案
1. 15-6(3-2p)/9 =1
15-(6-4p)/3 =1
15 =1 + (6-4p)/3
15-1 =(6-4p)/3
14*3 = 6-4p
42+4p = 6
4p = 6-42
4p = -36
p = -36/4
p = -9




2 . 3/4-5-3q-12 =2/3
3/4-5-q/4 =2/3
( 3-q)/4 =2/3
3-q = 2/3*4
3 =8/3 +q
3- 8/3 =q
1/3 = q
q = 1/3

2013-10-12 21:45:06 補充:
3. 1/5-4q-1/10 =3/20
4/20-4q-1 -2/20= 3/20
4/20 = 3/20+ 2/20 +1 +4q
4/20 = 25/20+4q
4/20-25/20 = 4q
-21/20 = 4q
( -21/20 ) * (1/4) = q
q = -21/80

2013-10-12 21:45:24 補充:
hope can help u ^^
參考: me
2013-10-13 6:10 am
1. 15-6(3-2p)/9=1
15-6(3-2p)=9
15-18+12p-9
12p=9-15+18
12p=12
p=12/12=1

2. 3/4-5-3q/12=2/3
9/12-5-3q/12=2/3
9-5+3q/12=2/3
9-5+3q=2/3 x 12
9-5+3q=8
3q=8-9+5
q=4/3

3. 1/5-4q-1/10=3/20
2/10-4q-1/10=3/20
2-4q+1/10=3/20
2-4q+1=3/20 x 10
2-4q+1=3/2
4q=2+1-3/2
4q=3-3/2
4q=6/2-3/2
4q=6-3/2
4q=3/2
q=3/2 /4
q=3/2 x 1/4
q=3/8


如果某些步驟你仍是看不明白,可補充再問,我會解釋為何這樣做該方程,希望幫到你啦!!
P.S.如無意外/誤會是沒有計錯的(把答案代入方程左方是完全等於右方的,但上面回答者答案錯了代入去是不等於的吧),因為其實我不知道第二條5-3q及第三條4q-1是否整個都是分子?如是便必定沒錯了
參考: 自己


收錄日期: 2021-04-20 23:41:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131012000051KK00221

檢視 Wayback Machine 備份