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7x4^23-9x4^22=19x4^22

Răspuns :

7×4^23-9x4^22=4^22 (7×4-9)=4^22 (28-9)=4^22×19

continuarea :

(7•4-9)•4^22=19•4^22
(28-9)•4^22=19•4^22
19•4^22=19•4^22

Adevărat ^^