Bonjour pouvez vous m'aider svp : n°53 n°33 n°70

bonjour

Numéro 70

a = 3/14 * 7/9 + 25/8 * 4/15
a = 21/126 + 100/120
a = 1/6 + 5/6
a = 6/6 = 1

b = 15/28 * 32/45 + 40/27 * 36/35
b = 480/1260 + 1440/945
b = 8/21 + 32/21
b = 40/21

c = 20/27 * 72/5 - 40/21 * 14/10
c = 1440/135 - 560/210
c = 32/3 - 8/3
c = 24/3 = 8 

numéro 33 

E = 4/5 *3/11 * 13/3 * 5/4 (tu simplifies tout avant de calculer)
E = 13/11

F  = 7/6 * 3/2 * 6/14 * 4/9
F = 14/42 = 1/3 

G = 25/16 * 3/16 * 32/15 * 4/5
G = 160/320 = 1/2 

H = 45/32 * 20/27 * 6/4 * 16/25
H = 270/270
H = 1

numéro 53 


a = 3/7 * ( 7/3 - 5/6)
a = 3/7 * ( 14/6 - 5/6)
a = 3/7 * 9/6
a = 27/42 = 9/14

b = 3/7 * 7/3 - 5/6
b = 21/21 - 5/6
b = 1 - 5/6
b = 6/6 - 5/6
b = 1/6


C = 12 * ( 1/3 - 1/6)
c = 12 * ( 2/6 - 1/6)
c = 12 * 1/6
c = 12/6 = 2

d = 12 * 1/3 - 1/6
d = 12/3 - 1/6
d = 24/6 - 1/6
d = 23/6