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ajutor pls .
multumesc


Ajutor Pls Multumesc class=

Răspuns :

20² - 15 × ( 10² - 9 ² )
20² - 15 × ( 100 - 81 )
20² - 15 × 19
400 - 285
115
(20•20)-15•[(10•10)-(9•9)]=
=400-15•(100-81)
=400-15•19
=400- 285
=115