Помогите решить Докажите тождество: (а+b)²-2ab+a³-b³=a2a
Докажите тождество: (a-b)²-2ab+2a+2a³-b²-a(3a-4b)
Докажите тождество: 2ab-(a+b)³+2a²-(a-b)(a+b)
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