Bonjour ;
A = 1/3 + 5/6
= (1 x 2)/(3 x 2) + 5/6
= 2/6 + 5/6
= (2 + 5)/6
= 7/6 .
B = 2/3 x 1/4
= (2 x 1)/(3 x 4)
= (2 x 1)/(3 x 2 x 2)
= 1/(3 x 2)
= 1/6 .
C = 1/5 - 2/3
= (1 x 3)/(5 x 3) - (2 x 5)/(3 x 5)
= 3/15 - 10/15
= (3 - 10)/15
= (- 7)/15
= - 7/15 .
D = 3 x 1/4
= 3/1 x 1/4
= (3 x 1)/(1 x 4)
= 3/4 .
E = 2/6 + 1/3 x (- 3)/4
= (2 x 2)/(2 x 6) - 1/3 x 3/4
= 4/12 - (1 x 3)/(3 x 4)
= 4/12 - 3/12
= (4 - 3)/12
= 1/12 .
