Bonjour Voila j'ai a faire ce devoir en math niveau 4 eme svp pourriez vous m'aider car je n'arrive vraiment pas svp merci d'avance

B = 9/7 - 3/7 = (9-3)/7 = 6/7

C= (1/3) + (1/6) = (2/6) + (1/6) = 3/6 = 1/3

D = (4/5)-(4/10) = (8/10) - (4/10) - (8-4)/10 = 4/10 = 2/5

E = 2 +(1/3) = (6/3) + (1/3) = (6+1)/3 = 7/3

F = (2/5) + (1/10) - (3/20) = (8/20) + (2/20) - (3/20) = (8+2-3)/20 = 7/20

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H = (7/2) x (4/9) = (7x4) / (2x9) = 28 / 18 = 14/9

I = 3 x (7/5) = 21/5

J = (16/25) x (47/8) = (16x47) / (25/8) = (2 x 8 x 47) / (8 x 25) = (2x47) / 25 = 94/25

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L = (2/3) x ((1/6) + (5/3)) = (2/3) x ((1+10)/6) = (2/3) x (11/6) = 22/18 = 11/9

M = ((3/2)-(1/4)) x ((3/2)+(1/4)) = ((6/4)-(1/4)) x ((6/4)+(1/4)) = (5/4) x (7/4) = 35/16

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dsl mais on ne voit pas les premieres lettres ni les énoncés de fin de page...