lim(n→∞) (n+1)(n+2) (n+3)/5n3次方+n 的极限?
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lim(n→∞)(n+1)(n+2)(n+3)/5n3次方+n的极限?lim(n→∞)(n+1)(n+2)(n+3)/5n3次方+n的极限?lim(n→∞)(n+1)(n+2)(n+3)/5n3次方+
lim(n→∞) (n+1)(n+2) (n+3)/5n3次方+n 的极限?
lim(n→∞) (n+1)(n+2) (n+3)/5n3次方+n 的极限?
lim(n→∞) (n+1)(n+2) (n+3)/5n3次方+n 的极限?
lim(n→∞) (n+1)(n+2)(n+3)/(5n³+n)
=lim(n→∞) (1+1/n)(1+2/n)(1+3/n)/(5+1/n²) .分子分母同时除以n³
=1/5
lim(n→∞) (n+1)(n+2) (n+3)/5n3次方+n
=lim(n→∞) (n^2+3n+2) (n+3)/(5n3次方+n)
=lim(n→∞) (n^3+3n^2+3n^2+6n+2n+6)/5n3次方+n
=lim(n→∞) (n^3+6n^2+8n+6)/5n3次方+n
=lim(n→∞) (1+6/n+8/n^2+6/n^3)/(5+1/n^2)
=1/5
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