maudmarine

Verified answer

Bonsoir,

A = - 5/3 + - 4/49  x 35/12
A = - 5/3 - 140/588
A= - 5 x 196 / 3 x 196 - 140/588
A = - 980/588 - 140/588
A = - 1120/588
A = 28 x - 40 / 28 x 21
A = - 40/21

B = (1/4 - 1/5) (7 + 37/9)
B = (1 x 5 / 4 x 5 - 1 x 4 / 5 x 4) (7 x 9 / 1 x 9 + 37/9)
B = (5/20 - 4/20) (63/9 + 37/9)
B = 1/20 x 100/9
B = 100/180
B = 20 x 5 / 20 x 9
B = 5/9

C = 1/3 - 2/5 x 15/8 + 7/12
            1/5 - 7/2

C =      1/3 - 30/40 + 7/12
       1 x 2 / 5 x 2 - 7 x 5 / 2 x 5

C = 1/3 - 10 x 3 / 10 x 4 + 7/12
              2/10 - 35/10

C = 1/3 - 3/4 + 7/12
           - 33/10

C = 1 x 4 / 3 x 4 - 3 x 3 / 4 x 3 + 7/12
                       - 33/10

C = 4/12 - 9/12 + 7/12
           - 33/10

C = 2/12 : - 33/10
C = 2/12 x - 10/33
C = - 20/396
C = 4 x - 5 / 4 x 99
C = - 5/99