(х + 2) (х + 11) - 2х (3 - 4х);
(а + 5) (а - 2) + (а - 4) (а + 6);
(у - 9) (Зу - 1) - (2у + 1) (5у - 7);
(4х - 1) (4х - 3) - (2х - 10) (8х + 1).
Упростить.
Заранее спасибо
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