Вариант 2. 50 баллов.
n1. Преобразовать выражение в многочлен:
1) (a+2)(b-3)
2) (3a-1)(2a+5)
3) (a+3b)(a^2-6ab-b^2)
n2. Упростить:
(a+2)(a-5)-3a(1-2a)
n3. Уравнение:
(x+3)(x-2)-(x+4)(x-1)=3x
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