Question

rút gọn biểu thức

a, x²(y - x) - y²(x - y) - x²y + xy²

b, (x + 3) (x² - 3x + 9) - x³

c, x (2x² - 3) - x² (5x + 1) + x

d, 3x (x - 2) - 5x (1 - x) - 8x² - 3 giúp emm

Answer 1

a: \(=x^2y-x^3-xy^2+y^3-x^2y+xy^2=y^3-x^3\)

b: \(=x^3+27-x^3=27\)

c: \(=2x^3-3x-5x^3+x^2=-3x^3+x^2-3x\)

d: \(=3x^2-6x-5x+5x^2-8x^2-3=-11x-3\)

Answer 2

a, \(=x^2y-x^3-xy^2+y^3-x^2y+xy^2=-x^3+y^3\)

b, \(=x^3+27-x^3=27\)

c, \(=2x^3-3x-5x^3-x^2+x=-3x^2-2x-x^2\)

d, \(=3x^2-6x-5x+5x^2-8x^2-3=-11x-3\)