Question

Va rogggg !!!!!!
49 puncte
Coronita

Answer 1

a. 5/7+2 (3/7) = 5/7 + 17/7 = 22/7
b. 3 (2/9) + 5/9 = 29/9 + 5/9 = 34/9
c. 5 (1/7) + 3 (4/7) = 36/7 + 25/7 = 61/7
d. 2 (1/8) +3 (1/6) = 17/8 + 19/6 = (se aduce la acelasi numitor prin amplificare pe care o voi nota cu "*") 3*17/8 + 4*19/6= 51/24 + 76/24 = 127/24
e.4 (5/6) + 3 (1/10) = 29/6 + 31/10 = 10*29/6 + 6*31/10 = 290/60 + 186/60 = 476/60 (simplifici si tu acolo unde se poate)
f. 11 (5/12) + 7 (7/18)= 137/12 + 133/18 = 3*137/12 + 2*133/18 = 411/36 + 266/36 = 677/36
g. 8 (4/15) + 5 (7/30) = 124/15 + 157/30 = 2*124/15 +157/30= 248/30 + 157/30 = 405/30
h. 9 (3/20) +4 (11/30) = 183/20 + 131/30 = 3*183/20 + 2*131/30 = 549/60 + 262/60 = 818/60