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Meilleure réponse !
2013-08-14T16:05:04+02:00

a) 10,5 +3 x (7 - 4) = 10.5 +3 x 3

                               = 10.5 + 9

                               = 19.5

 

b) 10,5 +3 x 7 - 4 = 10.5 + 21 -4

                             = 31.5 - 4

                             = 27.5

 

c)  (10.5 + 3) x 7 - 4 = 13.5 x 7 - 4

                                 =  94.5 - 4

                                 = 90.5

 

d) ( 10.5 + 3) x (7 - 4) = 13.5 x 3

                                   = 40.5

 

voila! en espérant t'avoir aidé :)