👤

Utilizand comutativitatea înmultirii ,efectuati cat mai rapid :
a)4*5,34*25
b)6,24*25*0,7*4
c)2,5*3,14*2*0,2*5


Răspuns :

a)4×5,34×25=
4×25×5,34=
100×5,34=
534
b)6,24×25×0,7×4=
25×4×6,24×0,7=
100×6,24×0,7=
624×0,7=
436,8
c)2,5×3,14×2×0,2×5=
2,5×2×0,2×5×3,14=
5×1×3,14=
15,70