Chọn câu sai A. (-15x^2 y^6) : (-5xy^2) = 3xy^4

(-15x²y⁶) : (-5xy²) = 3xy⁴

(8x⁵ – 4x³) : (-2x)³ = -4x² + 2

(3x²y² – 4xy² +2xy⁴) : (-12xy2) = -6x + 8y + 4y²

(3x – y)¹⁹ : (3x – y)¹⁰ = (3x – y)⁹