Вопрос пользователя:
2x(8x-1)-(4x-1)^2
4(3y-1)^2-18y(2y-1)
Илюха отвечает:
1) 2x(8x-1)-(4x-1)^2 = 16х^2-2х-(16х^2-8х+1)= 16х^2-2х-16х^2+8х-1=6х-1
2) 4(3y-1)^2-18y(2y-1) = 4(9у^2-6у+1) – 36у^2+18у = 36у^2-24у+4- 36у^2+18у= 4-6у
2x(8x-1)-(4x-1)^2
4(3y-1)^2-18y(2y-1)
1) 2x(8x-1)-(4x-1)^2 = 16х^2-2х-(16х^2-8х+1)= 16х^2-2х-16х^2+8х-1=6х-1
2) 4(3y-1)^2-18y(2y-1) = 4(9у^2-6у+1) – 36у^2+18у = 36у^2-24у+4- 36у^2+18у= 4-6у