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7xF=10x3x9-30:3:10+11

Răspuns :

7F=270-1+11
7F= 280
F=280÷7
F=40
7xF=30x9-30:3+11
7xF=270-30:3+11
7xF=240-10+11
7xF=230+11
7xF=241
F=241:7
F=34 rest 3