數學-解方程 中一題2

10] 19-7b-5b=-53
19-12b=-53
19+53=12b
72=12b
12b=72
b=6
11]2(2x-1)=6
2x-1=6/2
2x-1=3
2x=3+1
2x=4
x=2
12;] 3(2-z) = -9(負9)
2-z=-9/3
2-z=-3
2+3=z
5=z
z=5

10. 3
11. 4
12. 5
13. -2
14. -3
15. -3
16. 13
17. 5
18. 2
19. 21
20. -1

10) 19-7b-5b = -53
19-12b = -53
-12b = -72
b = 6

11) 2(2x-1) = 6
4x-2 = 6
4x = 8
x = 2

12)3(2-z) = -9
6-3z = -9
-3z = -15
z = 5

13)16= -8(5p+8)
16 = -40p-64
80 = -40p
-2 = p
p = -2

14) 5(7+3q)+12=2
35+15q+12 = 2
47+15q = 2
15q = -45
q = -3

15)7q=15+11q-3
7q = 12+11q
-4q = 12
q = -3

16)2b-6=b+7
2b-b = 7+6
b = 13

17)2p+1 = 0.4p+9
2p-0.4p = 9-1
1.6p = 8
p = 5

18)6m+4m-2=8+5m
10m-2 = 8+5m
10m-5m = 8+2
5m = 10
m = 2

19)7+2e=9e-14-6e
7+2e = 3e-14
2e-3e = -14-7
-e = -21
e = 21

20)5(m-1)=3m-7
5m-5 = 3m-7
5m-3m = -7+5
2m = -2
m = -1

10;] 19-7b-5b= -53(負53)
-12b=-72
b=6

11;] 2(2x-1)=6
4x-2=6
4x=8
x=2

12;] 3(2-z) = -9(負9)
6-3z=-9
-3z=-15
z=5

13;] 16= -8(5p+8)
16=-40p-64
-40p=60
p=-1.5

14;] 5(7+3q)+12=2
35+15q+12=2
15q=-45
q=-3

15;] 7q=15+11q-3
-4q=12
q=-3

16;] 2b-6=b+7
b=13

17;] 2p+1 = 0.4p+9
1.6p=8
p=5

18;] 6m+4m-2=8+5m
10m-2=8+5m
5m=10
m=2

19;] 7+2e=9e-14-6e
21=e

20;] 5(m-1)=3m-7
5m-5=3m-7
2m=-2
m=-1

10) 19-7b-5b = -53
19-12b = -53
-12b = -72
b = 6

11) 2(2x-1) = 6
4x-2 = 6
4x = 8
x = 2

12)3(2-z) = -9
6-3z = -9
-3z = -15
z = 5

13)16= -8(5p+8)
16 = -40p-64
80 = -40p
-2 = p
p = -2

14) 5(7+3q)+12=2
35+15q+12 = 2
47+15q = 2
15q = -45
q = -3

15)7q=15+11q-3
7q = 12+11q
-4q = 12
q = -3

16)2b-6=b+7
2b-b = 7+6
b = 13

17)2p+1 = 0.4p+9
2p-0.4p = 9-1
1.6p = 8
p = 5

18)6m+4m-2=8+5m
10m-2 = 8+5m
10m-5m = 8+2
5m = 10
m = 2

19)7+2e=9e-14-6e
7+2e = 3e-14
2e-3e = -14-7
-e = -21
e = 21

20)5(m-1)=3m-7
5m-5 = 3m-7
5m-3m = -7+5
2m = -2
m = -1