Question

数学问题 急~~~~试说明代数式x(x^2-2-3)+x^2(x+1)-2(x^3-2x-4)-x的值与x的取值无关

Answer 1

将式子展开

x(x^2-2-3)+x^2(x+1)-2(x^3-2x-4)-x

=x³-2x-3x+x³+x²-2x³+4x+8-x

=8