2x三次方+4x-1/3x二次方-(x+3x二次方 - 知识问答

2x三次方+4x-1/3x二次方-(x+3x二次方-2x三次方),其中x=-3

1个回答

=2x^3+4x-1/3x^2-x-3x^2+2x^3
=4x^3-10/3x^2+3x
=4(-3)^3-10/3(-3)^2+3*(-3)
=4*(-27)-10/3*9-9
=-108-39
=-147

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