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函數y=2x與y=x2的圖像的交點個數即函數f(x)=2x-x2 ;的零點的個數.顯然,x=2和x=4是函數f(x)的兩個零點.再由f(-1)=12-1=-12<0,f(0)=1-0=1,可得f(-1)f(0)<0,故函數在區間(-1,0)上有一個零點.故函數y=2x與y=x2的圖像的交點個數為3,故選D.
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