Question

in exercitiul 1-7 efectuati calculile a)5/12+9/12 b)4/15-7/15 c)2/21+1/7

Answer 1

5/12+9/12=14/12 Simplifici prin doi si iti da 7/6 ; 4/15-7/15=-3/15 Simplifici prin 3 si iti da -1/3 ; 2/21+1/7 aduci la același numitor (21) 2/21+3/21=5/21