bjr
Calculer astucieusement.
A = 46 x 99
= 46 (100 - 1) = 4600 - 46 = 4554
B = 48 x 76 + 48 x 24
= 48 (76 + 24) = 48 x 100 = 4800
C= 137 x 56 - 37 x 56
= 56 x (137 - 37) = 56 x 100 = 5600
D= 1 001 x 42
= (1000 + 1) x 42 = 42000+ 42 = 42042
E = 1 234 x 0,41 - 234 x 0,41
= (1234 - 234) x 0,41 = 1000 x 0,41 = 410
