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Calculeaza : 400+480:4-[680:2+4×(20+12+18)]

Răspuns :

= 400 + 120 -(340+4*50) = 520 - (340+200) = 520 -540 = -20

Succes!
20+12+18=50
4x50=200
680:2=340
340+200=540
480:4=120
400+120=520
520-540=-20 .......probabil ceva nu e corect , daca ne da raspuns negativ