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12+5{1502-10[(501:28+2)×7-3]}​

Răspuns :

Ce este inainte de paranteză? plus, minus?

Răspuns:

12+5{1502-10[(17,89+2)×7-3]}

12+5[1502-10(19,89x7-3)

12+5[1502-10(139,23-3)

12+5(1502-10×136,23)

12+5(1502-1362,3)

12+5×139.7

12+698,5

710,5