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quelqun peut m'aider svp je suis perdu je ne comprend absolument rien merci​

Quelqun Peut Maider Svp Je Suis Perdu Je Ne Comprend Absolument Rien Merci class=

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MAUDMARINE

Bonsoir

A = 2/3 + 7/3 x - 9/4

A = 2/3 - 63/12

A = (2 x 4) / (3 x 4) - 63/12

A = 8/12 - 63/12

A = - 55/12

B = (2 - 5/8) : 3/4

B = [(2 x 8) / (1 x 8) - 5/8] : 3/4

B = (16/8 - 5/8) : 3/4

B = 11/8 : 3/4

B = 11/8 x 4/3

B = 44/24

B = (4 x 11) / (4 x 6)

B = 11/6

C = (4/5 - 2) x (3/4 - 2/3)

C = [4/5 - (2 x 5) / (1 x 5)] x [(3 x 3) / (4 x 3) - (2 x 4) / (3 x 4)]

C = (4/5 - 10/5) x (9/12 - 8/12)

C = - 6/5 x 1/12

C = - 6/60

C = (6 x - 1) / (6 x 10)

C = - 1/10.

D = 2/13 - 5/13 : 10/16

D = 2/13 - 5/13 x 16/10

D = 2/13 - 80/130

D = (2 x 10) / (13 x 10) - 80/130

D = 20/130 - 80/130

D = 60/130

D = (10 x 6) / (10 x 13)

D = 6/13.