当x从右边趋近于0时(1+ax)^1/x的极限
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x趋向于1时求极限x²+ax+b/x-1=3
1)1+a+b=0
b=-a-1
lim(x->1)(x²+ax+b)/(x-1)
=lim(x->1)(x²+ax-a-1)/(x-1)
=lim(x->1)[(x+1)(x-1)+a(x-1)]/(x-1)
=lim(x->1)(x+1+a)
=2+a
=3
a=1
b=-1-1=-2
1)1+a+b=0
b=-a-1
lim(x->1)(x²+ax+b)/(x-1)
=lim(x->1)(x²+ax-a-1)/(x-1)
=lim(x->1)[(x+1)(x-1)+a(x-1)]/(x-1)
=lim(x->1)(x+1+a)
=2+a
=3
a=1
b=-1-1=-2
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