Réponse :

Explications étape par étape

Bonjour

Calculez:

a. 1/4 + 1/6

= (1 x 6)/(4 x 6) + (1 x 4)/(6 x 4)

= 6/24 + 4/24

= 10/24

= (2 x 5)/(2 x 12)

= 5/12

b. 3/4 +5/6

= (3 x 3)/(4 x 3) + (5 x 2)/(6 x 2)

= 9/12 + 10/12

= 19/12

c. 7/4 - 2/6

= (7 x 3)/(4 x 3) - (2 x 2)/(6 x 2)

= 21/12 - 4/12

= 17/12

d. -11/4 + -7/6

= (-11 x 3)/(4 x 3) - (7 x 2)/(6 x 2)

= -33/12 - 14/12

= -47/12

e.1/4 - 1/6

= (1 x 3)/(4 x 3) - (1 x 2)/(6 x 2)

= 3/12 - 2/12

= 1/12

f. 1/4 + 5/6

= (1 x 3)/(4 x 3) + (5 x 2)/(6 x 2)

= 3/12 + 10/12

= 13/12

Bonjour !

a) 1/4+1/6 = 1×6/4×6 + 1×4/6×4= 6/24+4/24= 10/24=5/12

b) 3/4+5/6 = 3×6/4×5 + 5×4/6×4 = 20/24 =5/6

Pour ta part de travail , tu effectues de même pour les autres .

Bonne journée .