(x³)³·(-x^4)³÷(2x²)^4÷(x³)²= =x^9*(-x^12)÷(16x^8)÷x^6=-x^21÷(16x^8)÷x^6=-1/16x^13÷x^6=-1/16x^7希望采纳!
-x的2次方