Question

Помогите пожалуйста! 1,2 номер​

Answer 1

$5 {a}^{2} - 20ab - 15b {}^{2} a = 5a(a - 4b - 3b {}^{2} ) = \\ = 5a( - 3b {}^{2} - 4b + a)$

$2x {}^{2} y {}^{3} + 4x {}^{4} y {}^{2} - 4x {}^{3} y {}^{3 } = \\ = 2 {x}^{2} y {}^{2} (y + 2 {x} ^{2} - 2xy) = \\ = 2x {}^{2} y {}^{2} (2x {}^{2} - 2xy + y)$

$2ax - 5a + 2bx +5 b = a(2x - 5) + b(2x + 5) = \\ = (a + b)(2x - 5)$

$5a {}^{3} + 10ab {}^{2} - 4a {}^{2} b - 8b {}^{3 } = \\ = 5a( {a}^{2} + 2b {}^{2} ) - 4b(a {}^{2} + 2b {}^{2} ) = \\ = (5a - 4b)(a {}^{2} + 2 {b}^{2} )$