(-5x^3)(-2x^2)·1/4x^4-2x^4·(-0.25x^5)

问题描述:

(-5x^3)(-2x^2)·1/4x^4-2x^4·(-0.25x^5)

(-5x^3)(-2x^2)·1/4x^4-2x^4·(-0.25x^5)
=10x^5·1/4x^4+0.5x^9
=2.5x^9+0.5x^9
=3x^9