Запишите в ответ номер верного равенства 1) (4-в)(в+4)=в^{2}-16
2) -(в-1)(3-4в)=(1-в)(4в-3)
3) (в+1)(3-2в)=3-в-в^{2}
4) (в-4)во второй степени=в^{2}-8в+16
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