.Упростите выражение:
(3x – 7y)(2х + 3y) – (4x - 5y)(3x + y)
Правильный ответ?
1) - 6х - 6хy – 16y ; 2) - 6х2 + 6хy – 26y2;
3) - 6х2 + 6хy – 16y2 ; 4) 6х2 + 6хy – 16y2 .
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