數學題3(以代數解決問題)

1)4+x=12
4+x-4=12-4
x=8

2) t-6=4
6-t+6=4+6
t=10

3) -5y=25
-5y/-5=-5

4)h/4=-5
h=-20

5)7x+5=61
7x=56
x=8

6)x-11/20=5
x-11=100
x=111

7)u+5=-4
u=-9

8)8-p=21
p=8-21
p=-13

9)-24/y=4
4y=-24
y=-6

10.
6x+1=43
x=7

11.
3x-2=13
x=5

12.
x-1/3=5
x=16

13.
x+17/23=6
x+17=138
x=121

14.
x/3+11=15
x/3=4
x=12

15.
2x-1/3=5
2x-1=15
x=8

16.
2x/3+1=5
2x/3=4
x=6

17.
3(x+5)=18
3x+15=18
x=1

18.
3(x-2)=18
x-2=6
x=8

19.
2/3(x+11)=26
x+11=39
x=28

1.
4+x=12
x=8
2.
t-6=4
t=10
3.
-5y=25
y=-5
4.
h/4=-5
h=-20
5.
7x+5=61
7x=56
x=8
6.
x-11/20=5
x-11=100
x=111
7.
u+5=-4
u=-9
8.
8-p=21
p=8-21
p=-13
9.
-24/y=4
4y=-24
y=-6
10.
6x+1=43
x=7
11.
3x-2=13
x=5
12.
x-1/3=5
x=16
13.
x+17/23=6
x+17=138
x=121
14.
x/3+11=15
x/3=4
x=12
15.
2x-1/3=5
2x-1=15
x=8
16.
2x/3+1=5
2x/3=4
x=6
17.
3(x+5)=18
3x+15=18
x=1
18.
3(x-2)=18
x-2=6
x=8
19.
2/3(x+11)=26
x+11=39
x=28

1. 4+x=12
x=12-4
x=8

2. t-6=4
t=4+6
t=10

3. -5y=25
y=25÷(-5)
y=-5

4. h÷4=5
h=5x4
h=20

5. 7x+5=61
7x=56
x=8

6. x-11÷20=5
x=5+0.55
x=5.55

7. u+5=-4
u=(-4)-5
u=-9

8. 8-p=21
8=21+p
8-21=p
p=-13

9. -24÷y=4
-24=4 x y
-24÷4=y
y=-6

10. 6x+1=43
6x=42
x=7

11. 3x-2=13
3x=15
x=5

12. x-1÷3=5
x=5+1÷3
x=5又3分之1

13. x+17÷23=6
x=6又23分之17

14. x÷3+11=15
x÷3=4
x=12

15. 2x-1÷3=5
x=2又3分之2

16. 2x÷3+1=5
2x÷3=4
2x=12
x=6

17. 3(x+5)=18
x+5=6
x=1

18. 3(x-2)=18
x-2=6
x=8

19.2÷3(x+11)=26
x+11=39
x=28

Phew...

1.4+x=12
x = 12 - 4
x = 8
2.t-6=4
t = 4 + 6
t = 10
3.-5y=25
y = 25/-5
y = -5
4.h/4=-5
h = -5 x 4
h = -20
5.7x+5=61
7x = 56
x= 8
6.x-11/20=5
x - 11 = 100
x = 111
7.u+5=-4
u = -4 - 5
u = -9
8.8-p=21
p = 8 - 21
p = -13
9.-24/y=4
y = -24/4
y = -6
10.6x+1=43
6x = 42
x = 7
11.3x-2=13
3x = 15
x = 5
12.x-1/3=5
x - 1 = 15
x = 16
13.x+17/23=6
x + 17 = 138
x = 121
14.x/3+11=15
x/3 = 4
x= 12
15.2x-1/3=5
2x - 1 = 15
2x = 16
x = 8
16.2x/3+1=5
2x / 3 = 4
2x = 12
x = 6
17.3(x+5)=18
3x + 15 = 18
3x = 3
x = 1
18.3(x-2)=18
3x - 6 = 18
3x = 24
x = 8
19.2/3(x+11)=26
2 / 3x + 33 = 26
2 = 78x + 858
78x = 856
x = -10 38/39

(1)
4+x=12
x = 12 - 4
x = 8


(2)
t-6=4
t = 4+6
t = 10

(3)
-5y=25
y = 25/ (-5)
y = -5

4.
h/4=-5
h = (-5)x4
h = -20

5.
7x+5=61
7x = 61-5
x = 56/7
x= 8

6.
x-11/20=5 ---------------------你條題目係 (x-11)/20 定係 x-(11/20)?
x = 5+11/20 = 111/20

(x-11)/20 =5
x-11 = 100
x = 111

7.
u+5=-4
u = -4 -5 = -9

8.
8-p=21
p = 8-21 = -13

9.
-24/y=4
y = -24/4 = -6

10.
6x+1=43
6x = 42
x =7

11.
3x-2=13
3x = 15
x=5

12.
x-1/3=5
x = 5+ 1/3 = 16/3

or if (x-1)/3 = 5
x-1 = 15
x=16

13.
x+17/23=6
x = 6 - 17/23 = 121/23

or if
(x+17)/23=6
x+17 = 138
x=121

14.
x/3+11=15
x/3 = 4
x=12

15.
2x-1/3=5
2x = 5+1/3 = 16/3
x=8/3

or if
(2x-1)/3 = 5
2x-1 = 15
2x = 16
x=8

16.
2x/3+1=5
2x/3 = 4
2x=12
x=6

17.
3(x+5)=18
x+5=6
x=1

18.
3(x-2)=18
x-2 =6
x=8

19.
2/3(x+11)=26
x+11 = 39
x = 28

1. 4+x = 12
x = 12-4
x = 8

2. t-6=4
t = 4+6
t = 10

3. -5y=25
y = 25/(-5)
y = -5

4. h/4 = -5
h = -5*4
h = -20

5. 7x+5 = 61
7x = 61-5
7x = 56
x = 56/7
x = 8

6. x-11/20 = 5
x - 11 = 5*20
x = 100 + 11
x = 111

7. u+5 = -4
u = -4-5
u = -9

8. 8-p = 21
-p = 21-8
-p = 13
p = -13

9. -24/y = 4
-24 = 4*y
-24/4 = y
y = -6

10. 6x+1 = 43
6x = 43-1
6x = 42
x = 42/6
x = 7

11. 3x-2 = 13
3x = 13+2
3x = 15
x = 15/3
x = 5

12. x-1/3 = 5
x-1 = 5*3
x = 15+1
x = 16

13. x + 17 / 23 = 6
x+ 17 = 6*23
x = 138 -17
x = 121

14. x/3+11 = 15
x/3 = 15-11
x = 4 *3
x = 12

15. 2x-1/3 = 5
2x-1 = 5*3
2x = 15+1
x = 16/2
x= 8

16. 2x/3 +1 = 5
2x/3 = 5-1
2x/3 = 4
2x = 4*3
x = 12/2
x = 6

17. 3(x+5) = 18
x+5 = 18/3
x = 6-5
x = 1

18. 3(x-2) = 18
x-2 = 18/3
x = 6+2
x = 8

19. 2/3(x+11) = 26
x+11 = 26*3/2
x+11 = 39
x = 39-11
x = 28

1.4+x=12
x=12-4
=8
2.t-6=4
t=6+4
=10
3.-5y=25
y=25/-5
=-5
4.h/4=-5
h=-5X4
=-20
5.7x+5=61
7x=56
x=8
6.x-11/20=5
x=5+11/20
=5 11/20
7.u+5=-4
u=-4-5
=-9
8.8-p=21
p=8-21
=-13
9.-24/y=4
y=-24/4
=-6
10.6x+1=43
6x=42
x=7
11.3x-2=13
3x=15
x=5
12.x-1/3=5
x=5+1/3
=5 1/3
13.x+17/23=6
x=6-17/23
=5 6/23
14.x/3+11=15
x/3=4
x=12
15.2x-1/3=5
2x=5 1/3
x=16/3X1/2
=8/3
16.2x/3+1=5
2x/3=4
2x=12
x=6
17.3(x+5)=18
x+5=6
x=1
18.3(x-2)=18
x-2=6
x=8
19.2/3(x+11)=26
x+11=39
x=28

1.x=12-4
=8
2.t=4+6
=10
3.y=25/-5
=-5
4.h=-5*4
=-20
5.x=61-5
=56/7
=8

1.
4+x=12
x=8
2.
t-6=4
t=10
3.
-5y=25
y=-5
4.
h/4=-5
h=-20
5.
7x+5=61
7x=56
x=8
6.
x-11/20=5
x-11=100
x=111
7.
u+5=-4
u=-9
8.
8-p=21
p=8-21
p=-13

9.
-24/y=4
4y=-24
y=-6
10.
6x+1=43
x=7
11.
3x-2=13
x=5
12.
x-1/3=5
x=16
13.
x+17/23=6
x+17=138
x=121
14.
x/3+11=15
x/3=4
x=12
15.
2x-1/3=5
2x-1=15
x=8
16.
2x/3+1=5
2x/3=4
x=6
17.
3(x+5)=18
3x+15=18
x=1
18.
3(x-2)=18
x-2=6
x=8
19.
2/3(x+11)=26
x+11=39
x=28