(x平方)立方-2x立方[x立方-x平方(4x+1)]

题目

(x平方)立方-2x立方[x立方-x平方(4x+1)]

答案

原式=x^6-2x³(x³-4x³-x²)
=x^6-2x³(-3x²-x²)
=x^6+6x^6+2x^5
=7x^6+2x^5