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rezolva in doua moduri 231+(450-120)=

Răspuns :

231+(450-120)=
=231+330=
=561

(231+450)-120=
=681-120=
=561
Primul mod:
231+(450-120)=
= 231+330=
=561

Al doilea mod:
(231+450)-120=
=681-120=
=561

SPER SA FIE BINE !