(1) (−3a2)3=−27a6(-3a^2)^3 = -27a^6(−3a2)3=−27a6 (2) (−2x2y)×4xy=−8x3y2(-2x^2y) \times 4xy = -8x^3y^2(−2x2y)×4xy=−8x3y2 (3) (−23a2bxy3)3=−827a6b3x3y9\left(-\frac{2}{3}a^2bxy^3\right)^3 = -\frac{8}{27}a^6b^3x^3y^9(−32a2bxy3)3=−278a6b3x3y9