Svp soyez sympatiques aidez moi :( Svp posez ecrivez comme en vrai parce que je ne comprend rien merci 551773 fois

a = 1/7 +3/14 = 2/14+3/14 = 5/14

b = 4/5 -3/15 = 4/5 -1/5 = 3/5

c = 1+3/4 = 4/4 +3/4 = 7/4

d = 4 x 5/8 = 20/8 = 5/2

e = 16/12 x 9/18 = 4/3x1/2 = 4/6 =2/3

f = 2/3 x3/4 x4/5 = 2/4 x 4/5 = 2/5

g = 2/3 x(1/6+ 5/3) = 2/3 x (1/6+10/6) = 2/3 x 11/6 = 22/18 = 11/9

h = 7/2 -3/4 x5/2 = 7/2 -15/8 = 28/8 -15/8 = 13/8

i = 5/6-3/18 +2/9 = 5/6 -1/6 +2/9 =4/6 +2/9 = 2/3+2/9 = 6/9+2/9 = 8/9

j = (3/2-1/4)(3/2+1/4) = (6/4-1/4)(6/4+1/4) = 5/4 x 7/4 = 35/16

k = 4/5 x (5/2 -(3/4+5/4) = 4/5 x (5/2-(8/4)) = 4/5 x (5/2 -2) = 4/5 x(5/2-4/2) = 4/5 x 1/2= 4/10 = 2/5