三题求详解! 20
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(4)化简=lim[(2x-1)/(2x+1)]^30×[(3x-2)/(2x+1)]^20
=[lim(1-2/(2x+1))]^30×[lim(1+1/(2+7/(x-3)]^20
=1×(3/2)^20
=(3/2)^20
(5) 他那n次根号我不清楚怎么算
(6)化简=lim[3/(1-x^3)-(x²+x+1)/(1-x)(x²+x+1)]
=lim(2-x-x²)/(1-x^3)
=lim[(x+2)(1-x)]/[(1-x)(x²+x+1)]
=lim(x+2)/(x²+x+1)
=1
期望对你有用,我也只是有所了解而已,有错误不要见怪
=[lim(1-2/(2x+1))]^30×[lim(1+1/(2+7/(x-3)]^20
=1×(3/2)^20
=(3/2)^20
(5) 他那n次根号我不清楚怎么算
(6)化简=lim[3/(1-x^3)-(x²+x+1)/(1-x)(x²+x+1)]
=lim(2-x-x²)/(1-x^3)
=lim[(x+2)(1-x)]/[(1-x)(x²+x+1)]
=lim(x+2)/(x²+x+1)
=1
期望对你有用,我也只是有所了解而已,有错误不要见怪
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