(5A+2A²-3-4A³)-(-A+3A³-A²)其中A=-2

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(5A+2A²-3-4A³)-(-A+3A³-A²)其中A=-2(5A+2A²-3-4A³)-(-A+3A³-A²)其中

(5A+2A²-3-4A³)-(-A+3A³-A²)其中A=-2
(5A+2A²-3-4A³)-(-A+3A³-A²)其中A=-2

(5A+2A²-3-4A³)-(-A+3A³-A²)其中A=-2
(5A+2A²-3-4A³)-(-A+3A³-A²)
=5A+2A²-3-4A³+A-3A³+A²
=-3+6A+3A²-7A³
=-3-12+12+56
=53

(5A+2A²-3-4A³)-(-A+3A³-A²)
=5A+2A²--34A³+A-3A³+A²
=5A+A+2A²+A²-4A³-3A³-3
=6A+3A²-7A³-3
当A=-2时
6A+3A²-7A³-3
=6*(-2)+3*(-2)²-7*(-2)³-3
=53