(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
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![(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2](/uploads/image/z/1261228-4-8.jpg?t=%EF%BC%883x%26%23178%3B-2%EF%BC%89-%EF%BC%884x%26%23178%3B-2x-3%EF%BC%89%2B%EF%BC%882x%26%23178%3B-1%EF%BC%89%E5%85%B6%E4%B8%ADx%3D-2)
(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
(3x²-2)-(4x²-2x-3)+(2x²-1)
=3x²-2-4x²+2x+3+2x²-1
=x²+2x
=(-2)²+2×(-2)
=4+(-4)
=0