原式＝lim(2^1.5)^2n-3×3^2n/(2^1.5)^2n+3^2n=lim[(2^1.5)/3]^2n-3/[(2^1.5)/3]^2n+1=-3
lim2^3n-3^(2n+1)/2^3n+3^2n趋近无穷大等于多少
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