Réponses

2014-01-26T12:45:35+01:00
(17.2 + 14+ 6.8) x2.5=
(24 +14)x2.5 = 
38 x2.5 = 
38+ 38+19= 95


6.27 x(4.75+5.25) =
6.75x 10 = 67.58
Voilà

2014-01-26T12:50:19+01:00
17,2x2,5-14x2,5+2,5x6,8=
2,5(17,2 -14 + 6,8)
2,5( 17,2+6,8-14)
2,5(24-14)
2,5*10= 25

6,27x4,75+6,27x5,25=
6,27(4,75 + 5,25)
6,27(10) = 62,7