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2014-03-22T17:12:14+01:00
Bonjour

A= (2 - 2/3) ÷ (3/2 - 4/3)
A = ( 6/3  -2/3) : ( 9/6- 8/6)
A = 4/3 : 1/6
A = 4/3 x 6 = 24/3  = 8

B= 8/3 - 5/3 ÷ 20/21

B = 8/3 - 5/3 x 21/20
B = 8/3 - 105/60
B = 160/60 - 105/60
B = 55/60 = 11/12