Salut
Exercice 49:
A=7/3-4/3 x 5/8
=7/3 - 4x5/3x8
=7/3 - 5/6
( même dénominateur)
=14-5/6=9/6
(Diviser par 3)
=3/2
B=[-4/9 x 1/5 ]x 7/3
= -4/45 x 7/3
=-28/135
C=-8/3 x 6/-5 + 7/4
=-8x6/3x-5 + 7/4
=8x2/5 + 7/4
=16/5 + 7/4
=99/20
Exercice 50:
(NB: % c’est une division)
L=-7/5 % (2/9 - 7/18)
=-7/5 % 4-7/18
=-7/5 % -3/18
=7/5 x 6
=42/5
M=(4/5+ -3/2)% (-9/4-1/6)
=-7/10 x -12/29
= 7x12/10x29
=82/290
=(82/290)%2
=42/145
Et de rien
