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y=2(x2+2x+3)−13x2+2x+3=2−13x2+2x+3;∵x2+2x+3=(x+1)2+2≥2;∴0<13x2+2x+3≤132∴−92≤2−13x2+2x+3<2原函數的值域是[−92,2).
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