3. Упростите выражение: 1) a) 7(a + 8) + (a + 8); в) 8(x-8) -6(x-6); 6) (x-3)-3(x-3); г) 11(3x-2) - 3(11x + 10); 2) a) 2x(x+6)- 4x(6-x); в) 7c(c + d) +7d(c-d); 6) 5y(5x-4y) - 3y(8y-7x); г) 56(3a – b) - За(5b + a); 3) a) x(x + 1) - (25 + x + 7); 6) 4y3(8y-2)+4y(y - 4y³); в) а(2а³ 7г)-2(7n² + a); r) 6(64-b³+b)-(b - 63 + b).

3. Упростите выражение:

1. a) $$7(a + 8) + (a + 8) = 7a + 56 + a + 8 = 8a + 64$$
2. в) $$8(x-8) -6(x-6) = 8x - 64 - 6x + 36 = 2x - 28$$
3. б) $$(x-3)-3(x-3) = x - 3 - 3x + 9 = -2x + 6$$
4. г) $$11(3x-2) - 3(11x + 10) = 33x - 22 - 33x - 30 = -52$$
5. a) $$2x(x+6)- 4x(6-x) = 2x^2 + 12x - 24x + 4x^2 = 6x^2 - 12x$$
6. в) $$7c(c + d) +7d(c-d) = 7c^2 + 7cd + 7cd - 7d^2 = 7c^2 + 14cd - 7d^2$$
7. б) $$5y(5x-4y) - 3y(8y-7x) = 25xy - 20y^2 - 24y^2 + 21xy = 46xy - 44y^2$$
8. г) $$5b(3a – b) - 3a(5b + a) = 15ab - 5b^2 - 15ab - 3a^2 = -5b^2 - 3a^2$$
9. a) $$x(x^5 + x) - (x^5 + x + 7) = x^6 + x^2 - x^5 - x - 7$$
10. б) $$4y^3(8y-2)+4y(y - 4y^3) = 32y^4 - 8y^3 + 4y^2 - 16y^4 = 16y^4 - 8y^3 + 4y^2$$
11. в) $$a(2a^3 - 7n) - 2(7n^2 + a) = 2a^4 - 7an - 14n^2 - 2a$$
12. г) $$b(b^4-b^3+b)-(b^5 - b^3 + b) = b^5 - b^4 + b^2 - b^5 + b^3 - b = -b^4 + b^3 + b^2 -b$$

Ответ: смотри решение