Q multimea numerelor rationale Operatii cu fractii ordinare

Adunarea si scaderea se aduc fractiile la acelasi numitor

a) 5

2+

5

4 = 1 +

6

5 =

2

1 +

4

3 =

3

5 -

5

1 =

18

5-12

1=

b) 7

6+

7

43 =

6

25 - 2 =

3

5 -

15

1 =

2

3 +

7

9 =

20

7-12

1=

c) 2

21-

2

9 = 4 -

5

2 =

20

7+

20

3 =

4

9 -

5

2 =

25

3+

10

7=

Inmultirea - se simplifica pe diagonala

a) 5

2

5

4 = 1

6

5 =

18

5

10

6 =

b) 2

1

4

3 =

5

2 4 =

20

7

49

2 =

c) 20

7

8

3 =

6

15 7 =

40

15

3

10 =

Impartirea - se transforma in operatie de inmultire b

a :

d

c =

b

a

c

d

a) 15

2 :

2

1= 1 :

7

6 =

18

15 :

2

3=

b) 2

1:

5

1 =

5

18 : 2 =

3

20 :

9

10 =

c) 7

10 :

4

7 = 8 :

6

80 =

5

108 :

25

2 =

Ridicarea la putere -

n

b

a

=

n

n

b

a

2

3

2

=

3

2

1

=

4

3

1

=

2

5

1

=

3

5

2

=

2

7

3

=