Упростите выражения:, Пожалуйста Помогите, Умоляю
1)4(a-1)^2 + (a-2)(6-a) - 13;
2)5(a-4)^2 - (a-4)(7-2a) + 20a^2;
3) - (a-5)^2 + (3a-2)(7-a) -18a+6;
4) - (4-2a)^2 - (3a-2)(6-a) +a^2;
5)7(2a+1)^2 - (3a-2)(6-2a) -3a^2;
6) - (3a -1)^2 - (4-5a)(7-2a) -5a^2;
7)(2a-5)^2 + (1-3a)(3-2a) -7a^2;
8)2(2a-3)^2 -3(3a+7)(4-a) +9a^2 +72a.
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