MATH....F.1方程 好多題...

No.1 2(3a-1)-4(2-a)=0
6a-2-8+a=0
7a-10=0
7a-10+10=0+10
7a=10
7a/7=10/7
a=10/7

No.2 12t+9-5t=8+2t-14
17t+9=2t-6
17t-2t+9-9=2t-6-2t-9
15t=-15
15t/15=-15/15
t=-1

No.3 6x-9=4x+5(3-2x)
6x-9=4x+15-10x
6x-9=15-6x
6x+6x-9+9=15-6x+6x+9
12x=24
12x/12=24/12
x=2

No.4 3+5x-2[x+3+2(x-5)]=4(3-2x)
3+5x-2(x+3+2x-10)=12-8x
3+5x-2x-6-4x+20=12-8x
17-x=12-8x
17-x+8x-17=12-8x+8x-17
7x=-5
7x/7=-5/7
x= -5/7

No.5 8x+3[4x-2(x+1)]=22
8x+3(4x-2x-2)=22
8x+12x-6x-6=22
14x-6=22
14x-6+6=22+6
14x=28
x=2

No.6 a/3-(4+a)=1/2(7-3a)
a/3-4-a=7/2-3a/2
a/3+3a/2-a=7/2+4
(2a+9a-6a)/6=(7+8)/2
2(2a+9a-6a)=6(7+8)
2*5a=90
5a=45
a=9

No.7 2x+1-(4x+5/3)=5(x+2)/6
2x+1-4x+5/3=(5x+10)/6
6(2x+1-4x+5/3)=5x+10
12x+6-24x+10=5x+10
-12x+16=5x+10
-17x=-6
x=6/17

希望幫到你，若那個步驟不清楚，可告知我！

No.1 是: a = 5
No.2 是: t = -3
No.7 是: x = -2

2(3a-1)-4(2-a) =0
6a-2-8+4a = 0
a = 1

12t+9-5t=8+2t-14
7t + 9 = 2t - 6
5t = -15
t = -3

6x-9=4x+5(3-2x)
6x - 9 = 4x + 15 - 10x
12x = 24
x = 2

3+5x-2[x+3+2(x-5)]=4(3-2x)
3 + 5x -2(x+3+2x-10) = 12 - 8x
3 + 5x - 6x + 14 = 12 - 8x
7x = = -5
x = -5/7

8x+3[4x-2(x+1)]=22
8x + 3(4x-2x-2) = 22
8x + 6x - 6 = 22
x = 2

a/3-(4+a)=1/2(7-3a)
2a - 24 - 6a = 6 - 9a
5a = 30
a =6

2x+1-(4x+5/3)=5(x+2)/6
12x + 6 - 24x - 10 = 5x + 10
- 17x = 14
x = -14/17

唔知right唔right ga!!!
1) 2(3a-1)-4(2-a)=0
(6a-2)-(8-4a)=0
6a-2=8-4a
6a+4a=8+2
10a=10
a=1

2) 12t+9-5t=8+2t-14
12t-5t+9=8-14+2t
7t+9=-6+2t
7t-2t=-6-9
5t=-15
t=-3

3) 6x-9=4x+5(3-2x)
6x-9=4x+15-10x
6x-9=4x-10x+15
6x-9=-6x+15
6x+6x=15-9
12x=6
x=0.5
or 1/2

4) 3+5x-2[x+3+2(x-5)]=4(3-2x)
3+5x-2[x+3+2x-10]=12-8x
3+5x-2[3x-7]=12-8x
3+5x-6x+14=12-8x
3+14+5x-6x=12-8x
17-1x=12-8x
-1x+8x=12-17
7x=-5
x=-5/7

之後果d help 唔到you la!!! sorry!!!

1) 2(3a-1)-4(2-a)=0 4) 3+5x-2[x+3+2(x-5)]=4(3-2x)
6a-2-8=4a =0 3+5x-2(x+3+2x-10)=12-8x
10a-10 =10 3+5x-2x-6-4x+20=12-8x
a =1 -x+17=12-8x
-x+8x=12-17
7x= -5
x =-5/7

2) 12t+9-5t=8+2t-14
7t+9 = - 6+2t
5t = -15
t = - 3


3) 6x-9=4x+5(3-2x)
6x-9=4x+15 -10x
6x+10x-4x=24
12x=24
x=2

5) 8x+3[4x-2(x+1)]=22
8x+3(4x-2x-2)=22
8x+12x-6x-6=22
2x+6=22
2x=16
x=8

7) 2x+1-(4x+5/3)=5(x+2)/6
2x+1-4x-3/5=(5x+10)/6
-2/3 -2x=(5x+10)/6
-4-12x=5x+10
17x=14
x=14/-17

no.1
2(3a-1)-4(2-a)=0
6a-2-8-4a=0
6a-4a=0-10
2a= -10
a= -10/2
a= -5