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11-(7×5-9×9:f:3):8=7 urgent va rog

Răspuns :

11-(35-81:3:f):8=7
11-(35-27:f):8=7
(35-27:f):8=4
35-27:f=4x8
27:f=35-32
27:f=3
f= 27:3
f=9