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074055ade
a fost răspuns

Efectuati utilizand factorul comun
A) 12•13+12•15+12•72
B) 125•234-125•28+125•194
C) 702•256-702•55+702•799
D) 1000•372+259•1000-153•1000

Răspuns :

Marandrada
a)
12×13+12×15+12×72=12×(13+15+72)=
=12×100=1200

b)
125×234-125×28+125×194=125×(234-28+194)=
=125×400=50000

c)
702×256-702×55+702×799=702×(256-55+799)=
=702×1000=702000

d)
1000×372+259×1000-153×1000=1000×(372+259-153)=
=1000×478=478000