Réponses

2012-09-19T19:00:47+02:00

(2/3)+(5/3)(4/7)(2/3+5/3x4/7) 

= (2/3) + (5/3)(4/7)(2/3 + 20/21)

= (2/3) + (20/21)(2/3 + 20/21)

= 2/3 + 40/63 + 400/441

=  294/441 + 280/441 + 400/441

= 974/441

 

2012-09-19T19:02:13+02:00

tu commence par les multiplications et les division ca donne 2/3=0.6et apres tu additionne le tout