先化简,再求值:x(x²-3)+x²(x-3)-3x(x²-x-1)

问题描述:

先化简,再求值:x(x²-3)+x²(x-3)-3x(x²-x-1)

=X3-3X+X3-3X2-3X3+3X2+3X=-X3 (X后面的数字是X次方)