(2x+3)(4x的2次方-6x+9)=
问题描述:
(2x+3)(4x的2次方-6x+9)=
答
(2x+3)(4x^2-6x+9)=2x(4x^2-6x+9)+3(4x^2-6x+9)
=8x^3-12x^2+18x+12x^2-18x+27
=8x^3+27