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Calculeaza in doua moduri 12×(30+50)

Răspuns :

a)Primul mod:
12×(30+50)=
=12×80=
=960.
b)Al doilea mod:
12×(30+50)=
=12×30+12×50=
=360+600=
=960.
12×(30+50)=12×80= 960 12×(30+50)=12×30+12×50=360+ +600=960