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Cireasa61
a fost răspuns

efectueaza [(510:10-294:6)x467-515:5]:3-30x9

Răspuns :

[(510:10-294:6)x467-515:5]:3-30x9=7

510:10=51
294:6=49
51-49=2
2x467=934
515:3=103
934-103=831
831:3=277
30x9=270
277-270=7 ..