x^3-18x^2+81x,怎么算?
问题描述:
x^3-18x^2+81x,怎么算?
答
x^3-18x^2+81x
=x(x²-18x+81)
=x(x-9)²
x^3-18x^2+81x,怎么算?
x^3-18x^2+81x
=x(x²-18x+81)
=x(x-9)²