數!!! plz..

1. x/3 + x/4 = 1又1/6
(4x+3x)/12=7/6
7x=14
x=2


2. x/3 = 1/2 - x/6
2x/6=3/6-x/6
2x=3-x
3x=3
x=1


3. 3x/5 - 0.1x = 1/2
6x/10-x/10=5/10
6x-x=5
5x=5
x=1


4. 1+ (3+x/7) = 9x/28
28/28+[4(3+x)]/28=9x/28
28+12+4x=9x
40=5x
x=8


5. 2/5 + x-1/3 = x+1/5
6/15+[5(x-1)]/15=[3(x+1)]/15
6+5x-5=3x+3
2x=2
x=1


6. 1-x/5 - x-4/2 = 3/2
[2(1-x)]/10-[5(x-4)]/10=15/10
2-2x-5x+20=15
-7x=--7
x=1


2007-10-04 16:51:39 補充：
第三位人兄edison9872一字不漏咁copy我d answer囉!

1)x/3 + x/4 = 1又1/6
4x+3x/12=7/6
7x*6=12*7
42x=84
x=2
2)x/3 = 1/2 - x/6
x/3=3-x/6
6x=9-3x
9x=9
x=1
3)3x/5 - 0.1x = 1/2
6x/10-x/10=1/2
5x=1/2
x=1/10
4)1+ (3+x/7) = 9x/28
1+(21+x/7)=9x/28
28+x/7=9x/28
28^2+28x=63x
28^2=35x
x=22.4
5)2/5 + x-1/3 = x+1/5

6/15+5x-5/15=x+1/5
5x+1/15=x+1/5
25x+5=15x+15
10x=10
x=1
6)1-x/5 - x-4/2 = 3/2

2-2x/10-5x-20/10=3/2
-7x-18/10=3/2
-14x-36=30
-14x=6
x=-3/7

1. x/3 + x/4 = 1又1/6

(4x+3x)/12=7/6

7x=14

x=2



2. x/3 = 1/2 - x/6

2x/6=3/6-x/6

2x=3-x

3x=3

x=1



3. 3x/5 - 0.1x = 1/2

6x/10-x/10=5/10

6x-x=5

5x=5

x=1



4. 1+ (3+x/7) = 9x/28

28/28+[4(3+x)]/28=9x/28

28+12+4x=9x

40=5x

x=8



5. 2/5 + x-1/3 = x+1/5

6/15+[5(x-1)]/15=[3(x+1)]/15

6+5x-5=3x+3

2x=2

x=1



6. 1-x/5 - x-4/2 = 3/2

[2(1-x)]/10-[5(x-4)]/10=15/10

2-2x-5x+20=15

-7x=--7

x=1

1.X=2
2.X=1
3.X=1
4.X=112/5
5.你係吾係寫錯題目阿？？
6.X=25/12