方程式!!!!!!!!!!!!!!

1. 4X=18+X
3X = 18
X = 6 //

2. 3Y=24-3Y
6Y = 24
Y = 4 //

3. 8-A=1
8 = 1+A
A = 7 //

4. 27+2B=5B
27 = 3B
B = 9 //

5. 13M-13=13
13M = 26
M = 2 //

6. 3N+7N=5*8
10N = 40
N = 4 //

7. X/4=1
X = 4 //

8. X/5=0.4
X = 0.8 //

9. 2Y/7=6
2Y = 42
Y = 21 //

10. 3Y/8=1 1/2
3Y/8=1+1/2
3Y/8 = ( 2+1 ) / 2
3Y / 8 = 12 / 8
3Y = 12
Y = 4 //

11. A/3=0.4
A = 1.2 //

12. A/0.7=0.7
A = 0.49 //

2007-01-13 14:31:29 補充：
我的答案是最早而又啱晒的~

3. 8-A=1 , 8-A+A=1+A , 8-1=1+A-1 ,7=A , A=7

??? 4. 27+2B=5B , 27+2B-2B=5B-2B , 27/3=3B/3 , 9=B , B=9

5. 13M-13+13=13+13 , 13M/13=26/13 , M=2

6. 10N/10=40/10 , N=4

7. 4X/4=1*4 , X=4

8. 5X/5=0.4*5 , X=2

9. 2Y/7 *7=6*7 , 2Y/2=42/2 , Y=21

11. 3A/3=0.4*3 , A=1.2

12. 0.7A/0.7=0.7*0.7 , A=4.9

要不要這麼多

1,4X=18+X
4X-X=18
3X=18
X=6
2,3Y=24-3Y
6Y=24
Y=4
3. 8-A=1
- A=1-8
A=7
4. 27+2B=5B
27=3B
B=9
5. 13M-13=13
13M=13+13
M=2
6. 3N+7N=5*8
10N=40
N=4
7. X/4=1
X=4
8.X/5=0.4
X=0.4*5
X=2
9. 2Y/7=6
2Y=6*7
2Y=42
Y=21
10.3Y/8=1 1/2
3Y=12
Y=4
11. A/3=0.4
A=1.2
12. A/0.7=0.7
A=0.49

1) 4x=18+x
4x-x=18
3x=18
x=6
2) 3y=24-3y
3y+3y=24
6y=24
y=4