Fisa 2 Operatii Cu Fractii Ordinare2
2
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 =
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Transcript of Fisa 2 Operatii Cu Fractii Ordinare2
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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
=
