Răspuns:
2.
a) 8/15-4/5-1/5=8/15-(4/15+1/15)=3/15=8/15-5/15
3/15=3/15 (simplifici cu 3)
1/5=1/5
b)13/14-(5/14-3/14)=13/14-5/14+3/14
13/14-2/14=11/14
8/14+3/14=11/4
11/14=11/14
c) (4*9+5)9-(2*9+1)9=41/9-19/9=22/9
(4-2)+(5/9-1/9)=2+4/9=(amplificam pe 2 cu 9)
(2*9+4)/9=22/9
3.
a) 7/3-12/20=7/3-3/5(aducem la acelasi numitor)
(7*5-3*3)/3*5=26/15
12/20(se simplifica cu 4)=3/5
b)40/100-1/20=2/5-1/20=(8-1)/)20=7/20
40/100=(simplificam cu 10 mai intai)= 4/10(simplificam cu 2)=2/5
Ceea ce ti-am trimis e continuarea de la exercitiu 3+ exercitiul 4 tot.
