Aider moi pour l exercice 52,66 svp c pour demain c niveau 5 eme je vous en supplie et je vous remercie en avance !!!

bonjour

a) 2/9 + 4/3 x 1/2 = 2/9 + 4/6 = 4/18 + 12/18 = 16/18 = 8/9

b) ( 2/9 + 4/3) x ( 1/2 + 5/4) 
    ( 4/18 + 24/18) x ( 4/8 + 10/8) = 28/18 x 14/8 = 392/144 = 49/18

c) 17/6 x 9/2 - 11/4 x 8/3 = 153/12 - 88/12 = 65/12

d) 17/6 x ( 9/2 - 11/4) x 8/3 = 17/6 x ( 18/4 - 11/4) x 8/3
   = 17/6 x 7/4 x 8/3 = 952/72 = 119/9



la figure 1 est un rectangle
P = 2 ( 46/3 + 17/9) = 2 ( 138/9 + 17/9) = 2 x 155/9 = 310/9 ≈ 34, 4
A = 46/3 x 17/9 = 782/27 ≈ 29 cm²

figure 2 = carré
P = 4 x 14/3 = 54/3 = 18 cm
A = 14/3 x 14/3 = 196/9 ≈ 22 cm²

figure 3 = triangle rectangle
P = ( 3/10 + 2/5) : 2 = ( 3/10 + 4/10) : 2 = 7/10 : 2 = 7/10 x 1/2 = 7/20 cm

a = (3/10 x 2/5) : 2 = 6/50 : 2 = 6/50 x 1/2 = 6/100