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Afla numarul necunoscut din expresiile 11-(7×5-9×9:f:3):8=7

Răspuns :

11-(7×5-9×9:f:3):8=7
(35-81:f:3):8=11-7
(35-27:f):8=4
35-27:f=4×8
35-27:f=32
27:f=35-32
27:f=3
f=27:3=9