Svp très urgent il aussi les simplifiées le plus simple possible merci

Salut :)

A = 3/14 x 7/9 + 25/8 x 4/15
A = (3 x 7 / 7 x 2 x 3 x 3) + (5 x 5x 4 / 2 x 4 x 3 x 5)
A = 1/6 + 5/6
A = 6/6
A = 1

B = 15/28 x 32/45 + 40/27 x 36/35
B = (3 x 5 x 4 x 8 / 4 x 7 x 3 x 3 x 5) + (4 x 5 x 9 x 4 / 3 x 9 x 5 x 7)
B = 8/21 + 16/21
B = 24/21
B = 3 x 8 / 3 x 7
B = 8/7

C = 20/27 x 72/5 - 40/21 x 14/10
C = (5 x 4 x 9 x 8 / 9 x 3 x 5) - (4 x 10 x 7 x 2 / 7 x 3 x 10)
C = 32/3 - 8/3
C = 29/3

J'espère t'avoir aidé(e)! :)