求算式:(x+2)²-2(x+1)(x-3)

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求算式:(x+2)²-2(x+1)(x-3)求算式:(x+2)²-2(x+1)(x-3)求算式:(x+2)²-2(x+1)(x-3)=x²+4x+4-2(x&#

求算式:(x+2)²-2(x+1)(x-3)
求算式:(x+2)²-2(x+1)(x-3)

求算式:(x+2)²-2(x+1)(x-3)
=x²+4x+4-2(x²-2x-3)
=x²+4x+4-2x²+4x+6
=-x²+10x+10