x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 ))

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x趋向于无穷时lim(3x-1)/(x^3乘以sin(1/x^2))x趋向于无穷时lim(3x-1)/(x^3乘以sin(1/x^2))x趋向于无穷时lim(3x-1)/(x^3乘以sin(1/x^2

x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 ))
x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 ))

x趋向于无穷时 lim (3x-1)/(x^3 乘以 sin(1/x^2 ))
令t=1\x
原式=limt→0 ( 3/t-1)/(1/t * sin t^2)
=limt→0 ( 3/t-1)/(1/t * t^2) -----这里用到无穷小量有关知识
=limt→0 (3-t)
=3