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Réponse :

bonjour

Explications étape par étape :

(2/5-1/3) +(3/4+1/6)

(2x3/5x3 - 1x5/3x5)  + 3x6/4x6+1x4/6x4)

=6/15-5/15 +18/24+4/24

=1/15 +22/24

=1/15 +11/12

=1x4/15x4  +11x5/12x5

=4/60+55/60

=59/60

11/7 -  3/7/x1/5

=11/7 -3/35

=11x5/7x5  -3/35

=55/35-3/35

=52/35

(2+1/7)  / (2-1/7)

(2x7/7 +1/7)  / 2x7/7-1/7

=14/7+1/7  /  14/7-1/7

=15/7  /  13/7

=15/7 x  7/13

=15/13