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10×3×9-33:3:11+11=7f

Răspuns :

(10×3×9)-(33:3:11)+11=7f
270-1+11=7f
269+11=7f
280=7f
7f=280⇒f=40

10×3×9-33:3:11+11=7f; 30•9-1+11=7f; 280=7f; f=40.