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f(x)的頂點為(-1,-1),顯然頂點在區間[-2,1]內. f(-2)=(-2)²;+2(-2)=0 f(1)=1+2=3 比較函數頂點縱坐標、兩端點處的函數值,可知,函數在[-2,1],最大值為3,最小值為-1, ∴值域是[-1,3]
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