Question

1. Раскройте скобки: а) 3x(x^4+x^2-1)

б) -5a(a^2-3a-4)

в) (4b^2-4b+16)*0,5b

г) 2a(2a^2-8ab+b^2)

д) x^2(x^5-x^3+2x-1)

е) -3z(-5z^3+2z^2-z+1)

Answer 1

$3x( {x}^{4} + {x}^{2} - 1) = 3 {x}^{5} + 3 {x}^{3} - 3x$$- 5a( {a}^{2} - 3a - 4) = - 5 {a}^{3} + 15 {a}^{2} + 20a$$(4 {b}^{2} - 4b + 16) \times 0.5b = 2 {b}^{3} - {b}^{2} + 8b$$2a(2 {a}^{2} - 8ab + {b}^{2} ) = 4 {a}^{3} - 16 {a}^{2} b + 2a {b}^{2}$${x}^{2} ( {x}^{5} - {x}^{3} + 2x - 1) = {x}^{7} - {x}^{5} + 2 {x}^{3} - {x}^{2}$$- 3z( - 5 {z}^{3} + 2 {z}^{2} - z + 1) = 15 {z}^{4} - 6 {z}^{3} + 3 {z}^{2} - 3z$