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(3×5la putrea2-6la puterea2÷3+5×4la puterea2+1):12+9

Răspuns :

(3×5²-6²÷3+5×4²+1):12+9 =
=
(3×25-36÷3+5×16+1):12+9 =
=
(75-12+80+1):12+9 =
=(155-11):12+9 =
=144:12+9 =
=12+9=21