2个回答
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f(x)
=2x+1 ; x≤1
=x^2-x+3 ; 1<x≤2
=x^3-1 ; x>2
f(1-)=f(1) =lim(x->1) (2x+1) = 3
f(1+) =lim(x->1) (x^2-x+3 ) = 3
=> lim(x->1) f(x)= 3 =f(1)
f(2-)=f(2) =lim(x->2) (x^2-x+3) = 4-2+3=5
f(2+) =lim(x->2) (x^3-1) = 8 -1 =7 ≠ f(2-)
=> lim(x->2) f(x) 不存在
=2x+1 ; x≤1
=x^2-x+3 ; 1<x≤2
=x^3-1 ; x>2
f(1-)=f(1) =lim(x->1) (2x+1) = 3
f(1+) =lim(x->1) (x^2-x+3 ) = 3
=> lim(x->1) f(x)= 3 =f(1)
f(2-)=f(2) =lim(x->2) (x^2-x+3) = 4-2+3=5
f(2+) =lim(x->2) (x^3-1) = 8 -1 =7 ≠ f(2-)
=> lim(x->2) f(x) 不存在
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