第2题怎么做?求过程!!!
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没看到第2题,如果是第(3)题,那么:
lim (2ⁿ⁺¹+3ⁿ⁺¹)/(2ⁿ+3ⁿ)
n→∞
=lim (2·2ⁿ+3·3ⁿ)/(2ⁿ+3ⁿ)
n→∞
=lim (2·2ⁿ+2·3ⁿ+3ⁿ)/(2ⁿ+3ⁿ)
n→∞
=lim [2·(2ⁿ+3ⁿ)+3ⁿ]/(2ⁿ+3ⁿ)
n→∞
=lim [2 +3ⁿ/(2ⁿ+3ⁿ)]
n→∞
=lim [2 +1/(⅔ⁿ+1)]
n→∞
=2+ 1/(0+1)
=2+1
=3
lim (2ⁿ⁺¹+3ⁿ⁺¹)/(2ⁿ+3ⁿ)
n→∞
=lim (2·2ⁿ+3·3ⁿ)/(2ⁿ+3ⁿ)
n→∞
=lim (2·2ⁿ+2·3ⁿ+3ⁿ)/(2ⁿ+3ⁿ)
n→∞
=lim [2·(2ⁿ+3ⁿ)+3ⁿ]/(2ⁿ+3ⁿ)
n→∞
=lim [2 +3ⁿ/(2ⁿ+3ⁿ)]
n→∞
=lim [2 +1/(⅔ⁿ+1)]
n→∞
=2+ 1/(0+1)
=2+1
=3
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谢谢啦
我打错了
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