б) (z^2 + 3z + 2)(z - 5) = z^3 - 5z^2 + 3z^2 + 15z + 2z - 10 = z^3 - 2z^2 + 17z - 10
г) (x^2 - xy + y^2)(x - y) = x^3 - x^2y - yx^2 + xy^2 + y^3 - y^2 = x^3 - 2x^2y + xy^2 + y^3
Упрощение выражений:
б) (3m^2 + 3n^2) - (2m + n)(m + 2n) = 3m^2 + 3n^2 - 2m^2 - 4mn - mn - 2n^2 = m^2 - 5mn - n^2
г) (c - 5)(c - 10) + 3c(c + 5) = c^2 - 10c - 5c + 50 + 3c^2 + 15c = 4c^2 + 0c + 50
б) (x - y)(2x - 3y) - (3x - y)(2x + y) = 2x^2 - 3xy - 2xy + 3y^2 - 6x^2 + 3xy - 3y^2 = -4x^2 + 4xy
г) (3c - d)(d + 3c) + (4c - d)(c - 4d) = 3cd + 9c^2 - d^2 - 3cd + 12c^2 - 4cd - 4c^2 + 16cd - 4d^2 = 12c^2 + 4cd - 5d^2
б) (z^2 + 3z + 2)(z - 5) = z^3 - 5z^2 + 3z^2 + 15z + 2z - 10 = z^3 - 2z^2 + 17z - 10
г) (x^2 - xy + y^2)(x - y) = x^3 - x^2y - yx^2 + xy^2 + y^3 - y^2 = x^3 - 2x^2y + xy^2 + y^3
Упрощение выражений:
б) (3m^2 + 3n^2) - (2m + n)(m + 2n) = 3m^2 + 3n^2 - 2m^2 - 4mn - mn - 2n^2 = m^2 - 5mn - n^2
г) (c - 5)(c - 10) + 3c(c + 5) = c^2 - 10c - 5c + 50 + 3c^2 + 15c = 4c^2 + 0c + 50
б) (x - y)(2x - 3y) - (3x - y)(2x + y) = 2x^2 - 3xy - 2xy + 3y^2 - 6x^2 + 3xy - 3y^2 = -4x^2 + 4xy
г) (3c - d)(d + 3c) + (4c - d)(c - 4d) = 3cd + 9c^2 - d^2 - 3cd + 12c^2 - 4cd - 4c^2 + 16cd - 4d^2 = 12c^2 + 4cd - 5d^2