Bonjour

P = - 9/7 x - 28/3 : 6/15

P =  252/21 x 15/6

P = 3 780/126

P = (126 x 30) / (126 x 1)

P = 30

R= - 3/25 + - 24/15 : 21/- 35

R = - 3/25 - 24/15 x - 35/21

R = - 3/25 + 840/315

R = - 2/25 + (105 x 8) / (105 x 3)

R = - 2/25 + 8/3

R = (- 2 x 3) / (25 x 3) + (8 x 25) / (3 x 25)

R = - 6/75 + 200/75

R = 194/75

S = - 2/3 x 6/8 - 3/4 : 1/- 2

S = - 12/24 - 3/4 x - 2

S = - 12/24 + 6/4

S = (12 x - 1) / (12 x 2) + (2 x 3) / (2 x 2)

S = - 1/2 + 3/2

S = 2/2

S = 1.

Bjr

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❤