Question

Aduceti la acelasi numitor fractiile : a)4 supra 5, 7 supra 10, 3 supra 4
B) 2 supra 3, 4 supra 9 , 20 supra 24 .c) 11 supra 12 , 6 supra 16 , 25 supra 30 d) 3 pe 1 supra 6 ,1 pe 2 supra 3 , 2 pe 3 supra 4

Answer 1

a)
4/5 = (4×4)/(4×5)= 16/20
7/10 = (2×7)/(2×10) = 14/20
3/4 = (3×5)/(4×5) = 15/20


b)
2/3 = (2×24)/(3×24) = 48/72
4/9 = (4×8)/(9×8) = 32/72
20/24 = (20×3)/(24×3) = 60/72

c)
11/12; 6/16; 25/30
12 = 2^2 × 3
16 = 2^4
30 = 2×3×5
---------------------c.m.m.m.c = 2^4× 3 × 5 = 240

11/12 = (11×20)/(12×20) = 220/240
6/16 = (6×15)/(16×15) = 90/240
25/30 = (25×8)/(30×8) = 200/240

d)
3/1/6 = 3×6 = 18/1
1/2/3 = 3/2
2/3/4 = 8/3

18/1 = 108/6
3/2 = 9/6
8/3 = 16/6