Question

1) Calculeaza aplicind propietatile inmultirii; a) 2×8×5 ; b) 12×5×20 ; c) 5×125×18×2×8 ; d) 125×37×8 ; e) 12×54+46×12 ; f) 147×(874-74) ; g) (567-17)×(47+13) Dau coroana

Answer 1

a)80
b)1200
c)180000
d)37000
e)648+552=1200
f)117600
g)33000

Answer 2

a) 2×8×5 =(2x5)x8=10x8=80
b) 12×5×20=12x(5x20)=12x100=1200 (asociativitate) 
 c) 5×125×18×2×8 =(5x2)x(125x8)x18=18x10x1000=180000
 d) 125×37×8 =(125x8)x37=1000x37=37000
 e) 12×54+46×12 =12x(54+46)=12x100=1200(distributivitate)
 f) 147×(874-74) =147x800=117600
g) (567-17)×(47+13) =550x60=33000