(3x²-2)-(4x²-2x-3)+(2x-3)+(2x²-1)其中x= -1

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(3x²-2)-(4x²-2x-3)+(2x-3)+(2x²-1)其中x= -1

(3x²-2)-(4x²-2x-3)+(2x-3)+(2x²-1)
=3x²-2-4x²+2x+3+2x-3+2x²-1
=x²+4x-3
=(-1)²-1×4-3
=-6