Question

zad.1 rozwiąż równania i sprawdź: 2x=5 4a=7 15-x=7 1/3 m-1 5/6=2 2/3 25:b=6 d:4=5 1/2 zad.2. rozwiąż równania bez sprawdzeń 3a+1 3/4= 2 1/5 1 2/3-5c=1 1/4 1/2p:1 3/4=8 Bardzo pilne!daje naj. Uwaga np.3/4 to ułamek trzy czwarte

Answer 1

2x = 5

x = 5/2

spr

2 * 5/2 = 5

5 = 5

4a = 7

a = 7/4

spr

4 * 7/4 = 7

7 = 7

15 - x = 7

- x = 7 - 15

-x = -8

x = 8

spr

15 - 8 = 7

7 = 7

1/3 m - 1 5/6 = 2 2/3

1/3 m = 2 2/3 + 1 5/6

1/3 m = 2 4/6 + 1 5/6 = 3 9/6 = 4 3/6 = 4 1/2

m = 4 1/2: 1/3 = 9/2  * 3 = 27/2

spr

1/3 * 27/2  - 1 5/6 = 2 2/3

27/6 - 1 5/6 = 2 2/3

3 9/6 - 1 5/6 = 2 4/6

2 4/6 = 2 4/6 

 25:b=6 

6b = 25

b = 25/6 

spr 

25 : 25/6 = 6

25 * 6/25 = 6

6 = 6 

d/4 = 5 1/2

d = 5 1/2 * 4

d = 22

spr

22/4 = 5 1/2

5 2/4 = 5 1/2

5 1/2 = 5 1/2

zad 2

3a + 1 3/4 = 2 1/5

3a = 2 1/5 - 1 3/4

3a = 2 4/20 - 1 15/20

3a = 1 24/20 - 1 15/20

3a = 9/20

a = 9/20 : 3

a = 9/20 * 1/3 = 3/20 

1 2/3 - 5c = 1 1/4

- 5c = 1 1/4 - 1 2/3

- 5c = 1 3/12 - 1 8/12 = - 5/12

-c = - 5/12 : 5

c = 5/12 * 1/5

c = 1/12 

1/2p : 1 3/4 = 8

1/2p : 7/4 = 8

1/2p * 4/7 = 8

4/14p = 8

2/7p = 8

2p = 56

p = 56/2 = 28