请问图中的第六题怎么做啊?求大神帮助一下吧!
1个回答
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6、f(x)=(x-1)|x²-3x+2|e^(x-2)
f(x)=(x-1)|(x-1)(x-2)|e^(x-2)
当 x<1或x>2时
f(x)=(x-1)²(x-2)e^(x-2)
f'(x)=2(x-1)(x-2)e^(x-2)+(x-1)²e^(x-2)+(x-1)²(x-2)e^(x-2)
当 1<x<2时
f(x)=-(x-1)²(x-2)e^(x-2)
f'(x)=-【2(x-1)(x-2)e^(x-2)+(x-1)²e^(x-2)+(x-1)²(x-2)e^(x-2)】
limf'(x)=0
x→1+
limf'(x)=0
x→1-
说明x=1处f(x)可导
limf'(x)=1
x→2+
limf'(x)=-1
x→2-
说明x=2处f(x)不可导
f(x)=(x-1)|(x-1)(x-2)|e^(x-2)
当 x<1或x>2时
f(x)=(x-1)²(x-2)e^(x-2)
f'(x)=2(x-1)(x-2)e^(x-2)+(x-1)²e^(x-2)+(x-1)²(x-2)e^(x-2)
当 1<x<2时
f(x)=-(x-1)²(x-2)e^(x-2)
f'(x)=-【2(x-1)(x-2)e^(x-2)+(x-1)²e^(x-2)+(x-1)²(x-2)e^(x-2)】
limf'(x)=0
x→1+
limf'(x)=0
x→1-
说明x=1处f(x)可导
limf'(x)=1
x→2+
limf'(x)=-1
x→2-
说明x=2处f(x)不可导
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