Bonsoir,
a) 7(8-3) + 22,7 - 15,256 =
56 -21 +22,7 - 15,256 = ? (utilise ta calculatrice)
b) 7/5 de 25=
(7*25) /5 =35
c) 4/3+52/8-17/6=
12/24 + 156/24 - 68/124 = 100/124 =50/ 62= 25/31
d) 6(6/2 + 32) =
6( 6/2 + 64/2) =
6* 70/2 = 420/2 = 210
e) 30%(30) - 0,8%(20) =
(30*30)/100 - (0,8*20)/100=
90/100 -16/100=
74/100= 0,74