高数极限3道题1题limx→正无穷(1 - 2/3x)^4x+12题limx→正无穷(x/1+x)^-2x+13题lim
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高数极限3道题
1题limx→正无穷(1 - 2/3x)^4x+1
2题limx→正无穷(x/1+x)^-2x+1
3题limx→正无穷(x+1/x-1)^x
2题是(x除1+x)^-2x+1
1题limx→正无穷(1 - 2/3x)^4x+1
2题limx→正无穷(x/1+x)^-2x+1
3题limx→正无穷(x+1/x-1)^x
2题是(x除1+x)^-2x+1
1题.原式=lim(x->+∞){[1-2/(3x)]^(4x+1)}
=lim(x->+∞){[1+(-2)/(3x)]^[(3x)/(-2)]}^[(-2)(4x+1)/(3x)]}
=e^{lim(x->+∞){[(-2)(4x+1)/(3x)]} (利用特殊极限)
=e^(-8/3)
2题.原式=lim(x->+∞){[1+(-1)/(1+x)]^(-2x+1)}
=lim(x->+∞){[1+(-1)/(1+x)]^[(1+x)/(-1)]}^[(2x-1)/(1+x)]
=e^{lim(x->+∞)[(2x-1)/(1+x)]} (利用特殊极限)
=e^2
3题.原式=lim(x->+∞){[(x+1)/(x-1)]^x}
=lim(x->+∞){[1+2/(x-1)]^[(x-1)/2]}^[2x/(x-1)]
=e^{lim(x->+∞)[2x/(x-1)]} (利用特殊极限)
=e^2
注:利用特殊极限lim(x->+∞)[(1+1/x)^x]=1
=lim(x->+∞){[1+(-2)/(3x)]^[(3x)/(-2)]}^[(-2)(4x+1)/(3x)]}
=e^{lim(x->+∞){[(-2)(4x+1)/(3x)]} (利用特殊极限)
=e^(-8/3)
2题.原式=lim(x->+∞){[1+(-1)/(1+x)]^(-2x+1)}
=lim(x->+∞){[1+(-1)/(1+x)]^[(1+x)/(-1)]}^[(2x-1)/(1+x)]
=e^{lim(x->+∞)[(2x-1)/(1+x)]} (利用特殊极限)
=e^2
3题.原式=lim(x->+∞){[(x+1)/(x-1)]^x}
=lim(x->+∞){[1+2/(x-1)]^[(x-1)/2]}^[2x/(x-1)]
=e^{lim(x->+∞)[2x/(x-1)]} (利用特殊极限)
=e^2
注:利用特殊极限lim(x->+∞)[(1+1/x)^x]=1
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