请问这题步骤是哪里出错了呀 跟答案差个负号?
1个回答
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lim(x->1)∫(1->x) f(t) dt /[ (2-x)^(3/2) -1 +(3/2)lnx ] (0/0 分子分母分别求导)
=lim(x->1) f(x) /[ -(3/2)(2-x)^(1/2) +(3/2)(1/x) ] (0/0 分子分母分别求导)
=lim(x->1) f'(x) /[ (3/4)(2-x)^(-1/2) -(3/2)(1/x^2) ]
= f'(1)/( 3/4 - 3/2 )
=(1/3)/ (-3/4)
=-4/9
=lim(x->1) f(x) /[ -(3/2)(2-x)^(1/2) +(3/2)(1/x) ] (0/0 分子分母分别求导)
=lim(x->1) f'(x) /[ (3/4)(2-x)^(-1/2) -(3/2)(1/x^2) ]
= f'(1)/( 3/4 - 3/2 )
=(1/3)/ (-3/4)
=-4/9
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