bonsoir j'ai besoin d' aide svp​

bonjour

A=3/16-7/12+1/4

=(3x3)/(16x3)-(7x4)/(12x4)+(1x12)/(12x4)

=9/48-28/48+12/48

=-7/48

-7/48x0=0

(15/8-1/4) x (3/4+15/12)

=15/8-(1x2)/(2x4)x(3x3)/(4x3)+15/12

=15/8-2/8x9/12+15/12

=13/8x24/12

=312/96 (on divise par 24)

=13/4

0x4/13=0

B=(1+1/3-1/2) x -5/6

=1+(1x2)/(3x2)-(1x3)/(2x3) x -5/6

=1+2/6-3/6x -5/6

=6/6+2/6-3/6 x -5/6

=5/6 x -5/6

=-25/36

-3/4 x 3/3+1/3-1/2

=-3/4 x 4/3-1/2

=-3/4 x (4x2)/(3x2)-(1x3)/(2x3)

=-3/4 x 8/6-3/6

=-3/4 x 5/6

=-15/24 ( on divise par 3)

=-5/8

-25/36 x -8/5=200/180=10/9