Bonsoir, pouvez-vous m'aider ? Calculer sous forme fractionnaire a) - 1/2 x ( - 5/7 ) b) - 2/9 x 11/5 c) 4 x ( - 7/ 5 ) d) - 4/ -7 x ( -

Bonsoir,

A) -1/2 x (-5/7)

(-) x (-) = (+)
1/2 x 5/7 = (1 x 5)/(2 x 7) = 5/14

B) -2/9 x 11/5

(-) x (+) = (-)
-(2 x 11)/(9 x 5) = -22/45

C) 4 x (-7/5)
-(4 x 7)/5 = -28/5

D) -4/-7 x (-5/9)
(-)/(-) = (+)
4/7 x (-5/9) = -20/63

E) -2 x (-4/7) = 8/7

F) -2/3 x -11/-9 = -22/27

Bonjour Paul08,
a) - 1/2 x ( - 5/7 )
=5/14
b) - 2/9 x 11/5
=-22/45
c) 4 x ( - 7/ 5 )
=-28/5
d) - 4/ -7 x ( - 5/9 )
=4/7×(-5/9)
=-20/63
e) - 2 x ( - 4/7 )
=8/7
f) - 2/3 x - 11/ - 9
=22/-27
À bientôt