Допоможіть будьласка Алгебра 7клас.
Спрости вираз:
1)(a-3)(a²+3a+9)-(a+2)(a²-2a+4)
2)(x+5)(x²-5x+25)+5(x-5)(x+5)
3)a(a+4)(a²-4a+16)-(a-2)(a+2)(a²+4)-(8a+4)²
Будьласка ♥️
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