Sagot :
bonjour
A = 3/5 + 2/5 x 7/6
= 3/5 + 14/30
= 18/30 + 14/30
= 32/30 = 16/15
B = 7/12 x ( 5/14 - 3 /14)
= 7/12 x 2/14
= 14/168 = 1/12
C = ( 1/3 - 2 ) : ( 1/2 + 3 )
= ( 1/3 - 6/3 ) : ( 1/2 + 6/2)
= - 5/3 : 7/2
= - 5/3 x 2/7
= - 10/21
Réponse :
Explications étape par étape :
Bonjour
A = 3/5 + 2/5 × 7/6 = 3/5 + (2×7)/(6×5) = 3/5 + (2×7)/(2×3×5) = 3/5 +7/15
A = 3/5 + 7/15 = 9/15 + 7/15 = 16/15
B = 7/12 × (5/14 - 3/14) = 7/12 × (2/14) = 7/12 × 1/7
B = 7/12 × 1/7 = (7×1)/(12×7) = 1/12
C = [1/3 - 2] / [1/2 + 3]
C = [1/3 - 6/3] / [1/2 + 6/2]
C = [-5/3] / [7/2]
C = (-5/3) × 2/7
C = -10/21