Bonjour
Calcule en respectant les priorités opératoires
1/2 - 3/4 x 16/9
= 1/2 - 48/54
= (1 x 27) / (2 x 27) - 48/54
= 27/54 - 48/54
= - 21/54
= (3 x - 7) / (3 x 18)
= - 7/18
(1/2 - 3/4) x 16/9
= [(1 x 2) / (2 x 2) - 3/4] x 16/9
= (2/4 - 3/4) x 16/9
= - 1/4 x 16/9
= - 16/36
= (4 x - 4) / (4 x 9)
= - 4/9
1/5 - 3/10 x 1/6 + 1/2
= 1/5 - 3/60 + 1/2
= (1 x 12) / (5 x 12) - 3/60 + (1 x 15) / (2 x 15)
= 12/60 - 3/60 + 15/60
= 27/60 - 3/60
= 24/60
= (12 x 2) / (12 x 5)
= 2/5
(1/5 - 3/10) x (1/6 + 1/2)
= [(1 x 2) / (5 x 2) - 3/10] x [1/6 + (1 x 3) / (2 x 3)]
= (2/10 - 3/10) x (1/6 + 3/6)
= - 1/10 x 4/6
= - 4/60
= (4 x - 1) / (4 x 15)
= - 1/15.
