а) (5а+3)в+5а+3 = (5а+3)(в+1)
б) 5ав+4в+5ас+4с = в(5а+4) + 4(с+5а)
а) (2а+3х)(5а-х)-(а+х)(10а-3х) = 10а^2 - 2ах + 15ах - 3x^2 - 10а^2 + 3ax + 10ах - 3х^2 = 13ах + 18ах - 7х^2 = 31ах - 7х^2
б) (7х+1)(х-5)+(3х-2)(2х+7) = 7х^2 - 35х + х - 5 + 6х^2 + 21х - 4х - 14 = 13х^2 - 17х - 19
а) (4+1)(Х+5)-(2х+1)(2х-3) = 5(х+5) - (2х+1)(2х-3) = 5x + 25 - 4x^2 + 6x - 3 = -4x^2 + 11x + 22
б) (4х+1)(Х+5)=(4х+1)(3х+2) => 4х^2 + 20х + х + 5 = 12х^2 + 8х + 3x + 2 => 4х^2 + 21x + 5 = 12х^2 + 11х + 2 => 8х^2 - 10х - 3 = 0 => х = -1, x = 0.375
а) (5а+3)в+5а+3 = (5а+3)(в+1)
б) 5ав+4в+5ас+4с = в(5а+4) + 4(с+5а)
а) (2а+3х)(5а-х)-(а+х)(10а-3х) = 10а^2 - 2ах + 15ах - 3x^2 - 10а^2 + 3ax + 10ах - 3х^2 = 13ах + 18ах - 7х^2 = 31ах - 7х^2
б) (7х+1)(х-5)+(3х-2)(2х+7) = 7х^2 - 35х + х - 5 + 6х^2 + 21х - 4х - 14 = 13х^2 - 17х - 19
а) (4+1)(Х+5)-(2х+1)(2х-3) = 5(х+5) - (2х+1)(2х-3) = 5x + 25 - 4x^2 + 6x - 3 = -4x^2 + 11x + 22
б) (4х+1)(Х+5)=(4х+1)(3х+2) => 4х^2 + 20х + х + 5 = 12х^2 + 8х + 3x + 2 => 4х^2 + 21x + 5 = 12х^2 + 11х + 2 => 8х^2 - 10х - 3 = 0 => х = -1, x = 0.375