Ответы на вопрос:
1.1) 2x(x⁴ – 5x³ + 3) = 2x⁵ – 10x⁴ + 6x
1.2) (y + 2)(3y – 5) = 3y² – 5y + 6y – 10 = 3y² + y – 10
1.3) (7x – 3y)(2x + 5y) = 14x² + 35xy – 6xy – 15y² = 14x² + 29xy – 15y²
2.1) 15xy – 25y² = 5y(3x – 5y)
2.2) 12a⁵ – 4a⁴ = 4a⁴(3a – 1)
2.3) 6a – 6y + ab – by = 6(a – y) + b(a – y) = (6 + b)(a – y)
3. 7x² + 21x = 0
7x(x + 3) = 0
7x = 0 ⇒ x₁ = 0
x + 3 = 0 ⇒ x₂ = –3
ответ: x₁ = 0, x₂ = –3.
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