f.1方程式

1. 2x + 3 = 13

2x + 3 – 3 = 13 – 3

2x = 10

2x / 2 = 10 / 2

x = 5

2. 2 = 6y – 16

6y – 16 + 16 = 2 + 16

6y = 18

6y / 6 = 18 / 6

y = 3

3. (y + 1) / 2 = 5

[(y + 1) / 2] X 2 = 5 X 2

y + 1 = 10

y + 1 – 1 = 10 – 1

y = 9

4. (2x - 1) / 3 = 5

[(2x - 1) / 3] X 3 = 5 X 3

2x – 1 = 15

2x – 1 + 1 = 15 + 1

2x = 16

2x / 2 = 16 / 2

x = 8

5. 3x – 2 = 16

3x – 2 + 2 = 16 + 2

3x = 18

3x / 3 = 18 / 3

x = 6

6. x / 2 + 1 = 5

x / 2 + 1 – 1 = 5 – 1

x / 2 = 4

x / 2 X 2 = 4 X 2

x = 8

7. (2x + 1) / 3 = 7

[(2x + 1) / 3] X 3 = 7 X 3

2x + 1 = 21

2x + 1 – 1 = 21 – 1

2x = 20

2x / 2 = 20 / 2

x = 10

8. (3x - 2) / 5 = 2

[(3x - 2) / 5] X 5 = 2 X 5

3x – 2 = 10

3x – 2 + 2 = 10 + 2

3x = 12

3x / 3 = 12 / 3

x = 4

1.2x+3=13, 2x=10 , x=5
2.2=6y-16 , 18=6y ,y=3
3.y+1/2=5 , y+1=10 ,y=9
4.2x-1/3=5 , 2x-1=15 , 2x=16 ,x=18
5.3x-2=16 , 3x=18 , x=6
6.x/2+1=5 , x+2/2=5 , x+2=10 , x=8
7.2x+1/3=7 , 2x+1=21 , 2x=20 , x=10
8.3x-2/5=2 , 3x-2=10 , 3x=12 , x=4
PS.你一定要學識呢d數,因為中二同中三都要用呢d數/更加難