Question

Thu gọn

a) 1/2 . (2x² - 4x + 6) - (2 + x) . x - 2 . (1 - 2x)

b) 6x + 2x . (5x - 3) -20 + 2x

c) 3x^{n - 2} . (xⁿ⁺²- yⁿ⁺²) + yⁿ⁺² . (3x^{n - 2} - y^{n - 2})

Thanks nhìu ạ !!!

Answer 1

a) \(=x^2-2x+3-2x-x^2-2+4x=1\)

b)\(=6x+10x^2-6x+2x=10x^2+2x=2x\left(5x+1\right)\)

c)\(=3x^{n-2}.x^{n+2}-3x^{n-2}.y^{n+2}+y^{n+2}.3x^{n-2}-y^{n+2}.y^{n-2}\)

\(=3x^{2n}-y^{2n}\)