Réponse :
bonsoir
1/3 + 3/4 x 2/5 = 1/3 + 6/20 = 20/60 + 18/60 = 38/60 = 19/30
5/4 - 1/4 x 5/2 = 5/4 - 5/8 = 10/8 - 5/8 = 5/8
( 1/2 + 4/3) : ( 3/5 - 2/7)
= ( 3/6 + 8/6) : ( 21/35 - 10/35) = 11/6 : 11 /35 = 11/6 x 35/11 = 35/6
( 3/4 - 5/3 ) ; ( 3/4 + 5/3 ) = ( 9/12 - 20/12) : ( 9/12 + 20/10)
= - 11 /12 : 29/12 = - 11/12 x 12/29 = - 132/348 = - 11/29
5 - 2/3 x 7/2 = 5 - 14/6 = 30/6 - 14/6 = 16/6 = 8/3
Explications étape par étape
