SVP aide en math calculer B= 13/8 - 5/8* 16/20= calculer C + 1/7 +3* 7/2+3/2 =

B = 13/8 - 5/8 * 16/20
B = 1/8 - 80/160
B = 1 x 20 / 8 x 20 - 80/160
B = 20/160 - 80/160
B = - 60/160
B = 20 x -3 / 20 x 8
B = - 3/8

C = 1/7 + 3 * 7/2 + 3/2
C = 1/7 + 21/2 + 3/2
C = 1 x 2 / 7 x 2 + 21 x 7 / 2 x 7 + 3 x 7 / 2 x 7
C = 2/14 + 147/14 + 21/14
C = 170/14
C = 2 x 85 / 2 x 7
C = 85/7