方程式 要列或詳細 急!!!!

2007-10-17 11:41 pm
5y-4(3y-2)=-20
2{p-2(p+1)}-1=8p+25
5(y+4)-6(8+3y)=-2

回答 (4)

2007-10-17 11:55 pm
✔ 最佳答案
5y-4(3y-2)=-20
5y-(12y-8)=-20
5y-12y+8=-20
-7y=-28
y=4

2{p-2(p+1)}-1=8p+25
2{p-(2p+2)}-1=8p+25
2{p-2p-2}-1=8p+25
2{-p-2}-1=8p+25
-2p-4-1=8p+25
-10p=30
p=-3

5(y+4)-6(8+3y)=-2
5y+20-(48+18y)=-2
5y+20-48-18y=-2
-13y=-2-20+48
-13y=26
y=-2
2007-10-18 1:51 am
5y-4(3y-2)=-20

5y-4(3y-2)=-20
  5y-12y+8=-20
     -7y+8=-20
       -7y=-28
        7y=28
         y=4

2{p-2(p+1)}-1=8p+25

2(p-2p-2)-1=8p+25
  2p-4p-4-1=8p+25
      -2p-5=8p+25
       -10p=30
         -p=3
          p=-3

5(y+4)-6(8+3y)=-2

5(y+4)-6(8+3y)=-2
  5y+20-48-18y=-2
       -13y-28=-2
          -13y=26
            -y=2
             y=-2



    
參考: My maths knowledge
2007-10-18 12:05 am
5y-4(3y-2)=-20
5Y-12y-8 =-20
20-8 = 12y-5y
12 = 7y
12/7 = y
y = 1 5/7

2{p-2(p+1)}-1=8p+25
2(p-2p+2)-1=8p+25
2p-4p+4-1=8p+25
-2p+3=8p+25
3-25=8p+2p
-22=10p
-22/10=p
p=-11/5
p=-2 1/5

5(y+4)-6(8+3y)=-2
5y+20-48+18y=-2
5y+18y=48-20-2
23y=26
y=26/23
y=1 3/23
2007-10-17 11:54 pm
5y-4(3y-2)=-20
5y-12y+8=-20
7y=28
y=4

2{p-2(p+1)}-1=8p+25
2{p-2p-2}-1=8p+25
2p-4p-4-1=8p+25
10p=30
p=3

5(y+4)-6(8+3y)=-2
5y+20-48-18y=-2
13y=26
y=2
參考: myself


收錄日期: 2021-04-13 19:30:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071017000051KK01558

檢視 Wayback Machine 備份