Bonsoir;

1/5 +2/5*3/4

= 1/5 +6/20

= 1/5 +3/10

= 1/5 *2/2 +3/10

= 2/10+3/10

= 5/10

= 1/2

Réponse :

bonjour

Explications étape par étape :

1/5 +2/5x3/4

=1/5  +  6/20

=1/5  +2x3/2x10

=1/5 +3/10

=1x2/5x2  +3/10

=2/10 +3/10

=5/10

=1x5/2x5

=1/2