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Pouvez vous m'aider svp ses urgent.
a)4/7+2/7
b)3/4+1/8
c)4/9+4/45
d)14/5-3/7


Répondre :

Bonjour,

a)4/7+2/7 = 6/7

b)3/4+1/8 = 3 x 2 / 4 x 2 + 1/8 = 6/8 + 1/8 = 7/8

c)4/9+4/45 = 4 x 5 / 9 x 5 + 4/45 = 20/45 + 4/45 = 24/45

d)14/5-3/7 = 14 x 7 / 5 x 7 - 3 x 5 / 7 x 5 = 98/35 - 15/35 = 83/35
a)4/7+2/7=6/7

b)3/4+1/8= (3*2+1)/8= 7/8

c)4/9+4/45= (4*5+4)/45= 24/45=8/15

d)14/5-3/7= (14*7-3*5)35= (98-15)*35=83/35