Bonjour j'aimerais avoir de l'aide pour ce cette exercice svp: 1) 2/5 x 13/7 + 2/5 x ( 1/7 + 1/14) 2) (10/8-1/4) x (7/12+2/3)
2/5 x 13/7 + 2/5 x (1/7 + 1/14) = 2x13/5x7 + 2/5x(2/14+1/14) = 26/35 + 2/5 x 3/14 = 26/35 + 6/70 = 52/70 + 6/70 = 58/70 = 29/35.
(10/8-1/4) x (7/12+2/3) = (10/8 - 2/8) x (7/12 + 8/12) = 8/8 x 15/12 = 1x15/12 = 15/12 = 3x5/3x4 = 5/4.
1) 2/5 x 13/7 + 2/5 x ( 1/7 + 1/14)
=26/35+2/5*3/14
=26/35+3/35
=29/35
2) (10/8-1/4) x (7/12+2/3)
=8/8*(7/12+8/12)
=15/12
=5/4