limX趋向于无穷(3x³-2x-1/5x³+2x²-2)
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limX趋向于无穷(3x³-2x-1/5x³+2x²-2)=lim(3/5(5x³+2x²-2)-6/5x²+6/5-2x-1)/(5x³+2x²-2)
=lim(3/5+(-6/5x²-2x-1/5)/(5x³+2x²-2))
=3/5+0
=3/5
其中limX趋向于无穷(-6/5x²-2x-1/5)/(5x³+2x²-2))
=lim((-6/(5x)-2/(x²)-1/(5x³))/(5+2/x-2/x²))
=0
=lim(3/5+(-6/5x²-2x-1/5)/(5x³+2x²-2))
=3/5+0
=3/5
其中limX趋向于无穷(-6/5x²-2x-1/5)/(5x³+2x²-2))
=lim((-6/(5x)-2/(x²)-1/(5x³))/(5+2/x-2/x²))
=0
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