Помогите пожалуйста! ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹


Упростите выражение.
(a²-b²)(2a+b)-ab(a+b)



Докажите тождество.
a(a-2)-8=(a+2)(a-4)
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