Répondre :
A = ( 4/3 + 3/10 ) : (5/2 - 2/5 )
= ( 40/30 + 9/30 ) : ( 25/10 - 4/10 )
= 49/30 : 21/10
= 49/30 x 10/21
= 490/630
= 7/9
= ( 40/30 + 9/30 ) : ( 25/10 - 4/10 )
= 49/30 : 21/10
= 49/30 x 10/21
= 490/630
= 7/9