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Adauga paranteze rotunde pt a obtine propoziti adevarate :5×4×3+2+1=75

Răspuns :

5 ×(4×3+2+1)=15
ptc 5 ×15 =75
5×(4×3+2+1)=75
=5x(12+2+1)=
=5x15=
=75