8題F1數 20point

NO1
3(2b-1)-4b=-13
6b-3-4b=-13
6b-4b=-13+3
2b=-10
b=-5

NO2
4t-5(3-2t)=13
4t-15+10t=13
4t+10t=13+15
14t=28
t=2

NO3
3a-2(2a+5)=-11
3a-4a-10=-11
3a-4a=-11+10
-a=-1
a=1

NO4
-2y+3(4y-7)=1
-2y+12y-21=1
-2y+12y=1+21
10y=22
y=11/5

NO5
5(m-2)+3=4(3-m)-1
5m-10+3=12-4m-1
5m+4m=12-1-3+10
9m=18
m=2

NO6
3(n+6)-5=2(n-2)
3n+18-5=2n-4
3n-2n=-4-18+5
n=-17

NO7
3(2y+1)-2(y-3)=1
6y+3-2y+6=1
6y-2y=1-3-6
4y=-8
y=-2

NO8
3a-(5a-9)=11-(3a+1)
3a-5a+9=11-3a-1
3a-5a+3a=11-1-9
-5a=1
a=-1/5

2007-10-10 18:50:58 補充：
Correction:NO83a-(5a-9)=11-(3a 1)3a-5a 9=11-3a-13a-5a 3a=11-1-93a=1a=1/3

2007-10-10 18:53:35 補充：
再更正：NO83a-(5a-9)=11-(3a 1)3a-5a 9=11-3a-13a-5a 3a=11-1-9a=1

2007-10-10 19:04:48 補充：
雖然我係做錯左一條...不過都係最後果個步驟加錯數咁就証明左我做完真係有check過先會搵倒個錯誤答案希望你可以揀我做最佳答案啦 =]

1)6b-3-4b=-13
2b-3=-13
2b=-10
b=-5

NO1
3(2b-1)-4b=-13
6b-3-4b=-13
6b-4b-3=-13
2b-3=-13
2b=-10
b=-5

NO2
4t-5(3-2t)=13
4t-(15-10t)=13
4t-15+10t=13
14t-15=13
14t=28
t=2

NO3
3a-2(2a+5)=-11
3a-(4a+10)=-11
3a-4a-10=-11
-a=-1
a=1

NO4
-2y+3(4y-7)=1
-2y+12y-21=1
-2y+12y-21=1
10y=22
y=2.2

NO5
5(m-2)+3=4(3-m)-1
5m-10+3=12-4m-1
9m=18
m=2

NO6
3(n+6)-5=2(n-2)
3n+18-5=2n-4
n+13=-4
n=-17

NO7
3(2y+1)-2(y-3)=1
6y+3-(2y-6)=1
6y+3-2y+6=1
4y+9=1
4y=-8
y=-2

NO8
3a-(5a-9)=11-(3a+1)
3a-5a+9=11-3a-1
3a-5a+3a=11-9-1
a=1

2007-10-10 18:58:37 補充：
我都冇錯…/.\

2007-10-12 16:19:47 補充：
wongyukfung2003,你係冇計錯數…不過串錯字…"COECTER"

3(2b-1)-4b=-13
6b - 3 - 4b = -13
2b - 3 = -13
2b = -10
b = -5
----------------------------------------
4t-5(3-2t)=13
4t - 15 + 10t = 13
14t - 15 = 13
14t = 28
t = 2

----------------------------------------
3a-2(2a+5)=-11
3a - 4a - 10 = -11
3a - 4a = -1
-a = -1
a = 1
----------------------------------------
-2y+3(4y-7)=1
-2y + 12y - 21 = 1
10y - 21 = 1
10y = 22
y = 11/5

----------------------------------------
5(m-2)+3=4(3-m)-1
5m - 10 + 3 = 12 - 4m - 1
5m - 7 = 11 - 4m
9m - 7 = 11
9m = 18
m = 2
----------------------------------------
3(n+6)-5=2(n-2)
3n + 18 - 5 = 2n - 4
3n + 13 = 2n - 4
n + 13 = - 4
n = -17
----------------------------------------
3(2y+1)-2(y-3)=1
6y + 3 - 2y + 6 = 1
4y + 3 + 6 = 1
4y = -8
y = -2
----------------------------------------
3a-(5a-9)=11-(3a+1)
3a - 5a + 9 = 11 - 3a - 1
-2a + 9 = 10 - 3a
a + 9 = 10
a = 1


2007-10-10 18:57:14 補充：
慢左, 不過我無做錯,唔該投我票, 唔該