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25 |
8 |
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2 |
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2 |
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9 |
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9 |
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5 |
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2 |
5 |
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5 |
2 |
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A.y=-x2+2x+4 | B.y=-ax2-2ax-3(a>0) |
C.y=-2x2-4x-5 | D.y=ax2-2ax+a-3(a<0) |
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