(-2a的3次方b的2次方c)的3次方÷(3a的2次方b的3次方)+(-a的4次方c)(-2ac的2次方)
=-8a^9b^6c^3÷3a^2b^3+8a^5c^3
=-8/3a^7b^3c^3+8a^5c^3