Calculer et donner le résultat sous la forme d'une fraction la plus simple possible: A= 1/5 + 3/5 B= 9/7 - 3/7 C= 1/3 + 1/6 D= 4/5 -3/10 E= 2+1/3 F= 2/5 + 1

A= 1 / 5 + 3 / 5 = (1 + 3) / 5 = 4 / 5

B= 9 / 7 - 3 / 7 = (9 - 3) / 7 = 6 / 7

C= 1 / 3 + 1 / 6 = 2 / 6 + 1 / 6 = (2 + 1) / 6 = 3 / 6 = 1 / 2

D= 4 / 5 - 3 / 10 = 8 / 10 - 3 / 10 = (8 - 3) / 10 = 5 / 10 = 1 / 2

E= 2 + 1 / 3 = 6 / 3 + 1 / 3 = (6 + 1) / 3 = 7 / 3

F= 2 / 5 + 1 / 10 - 3 / 20 = 8 / 20 + 2 / 20 - 3 / 20 = (8 + 2 - 3) / 20 = 7 / 20

Salut :)

[tex]A = \frac{1}{5} + \frac{3}{5} \\ \\ A = \frac{4}{5} \\ \\ \\ B= \frac{9}{7} - \frac{3}{7} \\ \\ B = \frac{6}{7} \\ \\ \\ C = \frac{1}{3} + \frac{1}{6} \\ \\ C = \frac{1*2}{3*2} + \frac{1}{6} \\ \\ C = \frac{2}{6}+ \frac{1}{6} \\ \\ C = \frac{3}{6} \\ \\ C = \frac{1}{2} [/tex]


[tex]D = \frac{4}{5} - \frac{3}{10} \\ \\ D = \frac{4*2}{5*2} - \frac{3}{10} \\ \\ D = \frac{8}{10} - \frac{3}{10} \\ \\ D = \frac{5}{10} \\ \\ D = \frac{1}{2} \\ \\ \\ E = 2+ \frac{1}{3} \\ \\ E = \frac{2}{1} + \frac{1}{3} \\ \\ E = \frac{2*3}{1*3}+ \frac{1}{3} \\ \\ E = \frac{6}{3}+ \frac{1}{3} \\ \\ E = \frac{7}{3} [/tex]


[tex]F = \frac{2}{5} + \frac{1}{10} - \frac{3}{20} \\ \\ F = \frac{2*4}{5*4} + \frac{2*1}{2*10} - \frac{3}{20} \\ \\ F = \frac{8}{20} + \frac{2}{20} - \frac{3}{20} \\ \\ F = \frac{10}{20} - \frac{3}{20} \\ \\ F = \frac{7}{20} [/tex]

J'espère t'avoir aidé(e) ! :)