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x²-2x²+5-x²-3
=(x²-2x²-x²)+(5-3)
=-2x²+2
=-2×(-1/2)²+2
=-1/2+2
=3/2
=(x²-2x²-x²)+(5-3)
=-2x²+2
=-2×(-1/2)²+2
=-1/2+2
=3/2
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展开全部
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