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问题: 求极限

趋近无穷大时,(x+3)/(x-1)的x+3次幂的极限

解答:

Lim [(x+3)/(x-1)]^(x+3)
=lim[1+ 4/(x-1)]^(x+3)
=lim{1+ [1/(x-1)/4]}^{[(x-1)/4]*4 +4}
=lim{1+ [1/(x-1)/4]}^{[(x-1)/4]*4 }*lim(1+ 4/(x-1)]}^4
x趋近无穷大时
=e^4 *1=e^4