Question

Rozwiąż rownania i sprawdź

1) 2*x=5

2) 4a=7

3) 15-x=7 i jedna trzecia

4) m-1 i pięć szustych=2 i dwie trzecie

5) 25:b=6

6) d:4=5 i jedna druga

Answer 1

1) 2*x=5

x = 5 : 2

x = 2 i 1/2

spr.  2 * 2 i 1/2 = 2 * 5/2 = 5

 

2) 4a=7

a = 7 : 4

a = 7/4 = 1 i 3/4

spr.  4 * 7/4 = 7

 

3) 15-x=7 i 1/3

x = 15 - 7 i 1/3

x = 14 i 3/3 - 7 i 1/3

x = 7 i 2/3

spr.   15 - 7 i 2/3 = 14 i 3/3 - 7 i 2/3 = 7 i 1/3

 

 

4) m-1 i 5/6 =2 i 2/3

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

m = 2 i 4/6 + 1 i 5/6

m = 3 i 9/6

m = 4 i 3/6

m = 4 i 1/2

spr.   4 i 1/2 - 1 i 5/6 = 4 i 3/6 - 1 i 5/6 = 3 i 9/6 - 1 i 5/6 = 2 i 4/6 = 2 i 2/3

 

5) 25:b=6

b = 25 : 6

b = 25/6

b = 4 i 1/6

spr.  25 : 4 i 1/6 = 25 : 25/6 = 25 * 6/25 = 6

 

6) d:4=5 i 1/2

d = 5 i 1/2 * 4

d = 11/2 * 4

d = 22

spr. 22 : 4 = 22/4 = 11/2 = 5 i 1/2

Answer 2

2x=5   /:2

x=2i1/2

spr.

2*2i1/2=5

5=5

L=P

4a=7   /:4

a=7/4

spr.

4*7/4=7

7=7

L=P

15-x=7i1/3

-x=-15+7i1/3

-x=-7i2/3   /*(-1)

x=7i2/3

spr.

15-7i2/3=7i1/3

7i1/3=7i1/3

L=P

m-1i5/6=2i2/3

m=16/6+11/6

m=27/6

m=4i1/2=4i3/6

spr.

27/6-11/6=16/6

16/6=16/6

L=P

25:b=6  

b=4i1/6

spr.

25:4i1/6=25*6/25

6=6

L=P

d:4=5i1/2   /*4

d=11/2*4

d=22

spr.

22:4=5i1/2

 

5i1/2=5i1/2

L=P