Question

Aduceti la cel mai mic numitor comun fractile. 2/3 3/4 ,5/12 7/18, 5,/6 4/9, 12/18 1/3,15/20 3/8 ,7/9 7/63​

Answer 1

$\dfrac{ ^{4)} 2}{3} = \dfrac{8}{12}\ \ si \ \ \dfrac{ ^{3)} 3}{4} = \dfrac{9}{12}$

12 = 2²×3; 18 = 2×3² => [12;18] = 2²×3² = 36

$\dfrac{ ^{3)} 5}{12} = \dfrac{15}{36}\ \ si \ \ \dfrac{ ^{2)} 7}{18} = \dfrac{14}{36}$

6 = 2×3; 9 = 3² => [6;9] = 2×3² = 18

$\dfrac{ ^{3)} 5}{6} = \dfrac{15}{18}\ \ si \ \ \dfrac{ ^{2)} 4}{9} = \dfrac{8}{18}$

18 = 2×3² => [3;18] = 18

$\dfrac{12}{18}\ \ si \ \ \dfrac{ ^{6)} 1}{3} = \dfrac{6}{18}$

20 = 2²×5; 8 = 2³ => [20;8] = 2³×5 = 40

$\dfrac{ ^{2)} 15}{20} = \dfrac{30}{40}\ \ si \ \ \dfrac{ ^{5)} 3}{8} = \dfrac{15}{40}$

9 = 3²; 63 = 3²×7 => [9;63] = 3²×7 = 63

$\dfrac{ ^{7)} 7}{9} = \dfrac{49}{63}\ \ si \ \ \dfrac{7}{63}$