计算2x的5次方×(-x)的平方-(-x的2次方)的3次方×(-7x)

问题描述:

计算2x的5次方×(-x)的平方-(-x的2次方)的3次方×(-7x)

原式=2x^5×x²-(-x^6)×(-7x)
=2x^7-7x^7
=-5x^7

2x^5×(-x)^2-(-x^2)^3×(-7x)
=2x^5×x^2-(-x^6)×(-7x)
=2x^7-7x^7
=-5x^7