Sagot :
Bonjour,
Réponse :
A) - 1/4 + 11/4
= 10/4
= (2x5)/(2x2)
= 5/2
B) 2/3 + 5/6
= (2x2)/(3x2) + 5/6
= 4/6 + 5/6
= 9/6
= (3x3)/(3x2)
= 3/2
C) 3/4 - 5/6
= (3x6)/(4x6) - (5x4)/-(6x4)
= 18/24 - 20/24
= -2/24 = - (2x1)/(2x12)
= -1/12
D) 4/7 -3/4
= (4X4)/(7X4) - ( 3x7)/(4x7)
= 16/28 - 21/28
= -5/28