даю 25 балов!!!!!!!!!!!!!!!!
Выполните действия:
1) 3(1 + 2ху)( 1 - 2ху); 2) (а + 6)² – (а - 6)²; 3) ( 2х - 3у)².
5. Решите уравнение:
16у² – 49 = 0.
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