问一个极限和连续的例题~我看不懂那个例题的意思!f(x)= 1.x^2-1 0≤x≤1 2.x+3 x>1 求x=1的这个点的连续性.limf(x)= lim (x^2-1)=0 x→1- x→1- lim f(x)=lim (x+3)=4 x→1+ x→1+ 所以f(x)在x=1处仅左连续.为什么
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![问一个极限和连续的例题~我看不懂那个例题的意思!f(x)= 1.x^2-1 0≤x≤1 2.x+3 x>1 求x=1的这个点的连续性.limf(x)= lim (x^2-1)=0 x→1- x→1- lim f(x)=lim (x+3)=4 x→1+ x→1+ 所以f(x)在x=1处仅左连续.为什么](/uploads/image/z/1802851-43-1.jpg?t=%E9%97%AE%E4%B8%80%E4%B8%AA%E6%9E%81%E9%99%90%E5%92%8C%E8%BF%9E%E7%BB%AD%E7%9A%84%E4%BE%8B%E9%A2%98%7E%E6%88%91%E7%9C%8B%E4%B8%8D%E6%87%82%E9%82%A3%E4%B8%AA%E4%BE%8B%E9%A2%98%E7%9A%84%E6%84%8F%E6%80%9D%21f%28x%29%3D+1.x%5E2-1+0%E2%89%A4x%E2%89%A41+2.x%2B3+x%EF%BC%9E1+%E6%B1%82x%3D1%E7%9A%84%E8%BF%99%E4%B8%AA%E7%82%B9%E7%9A%84%E8%BF%9E%E7%BB%AD%E6%80%A7.limf%28x%29%3D+lim+%28x%5E2-1%29%3D0+x%E2%86%921-+x%E2%86%921-+lim+f%28x%29%3Dlim+%28x%2B3%29%3D4+x%E2%86%921%2B+x%E2%86%921%2B+%E6%89%80%E4%BB%A5f%28x%29%E5%9C%A8x%3D1%E5%A4%84%E4%BB%85%E5%B7%A6%E8%BF%9E%E7%BB%AD.%E4%B8%BA%E4%BB%80%E4%B9%88)
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