作业帮已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.
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![已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.](/uploads/image/z/10912312-64-2.jpg?t=%E5%B7%B2%E7%9F%A5%7Blimx%E8%B6%8B%E8%BF%910+%5B%EF%BC%88sin6x%EF%BC%89%2Bxf%28x%29%5D%2Fx%5E3%7D%3D0+%E6%B1%82limx%E8%B6%8B%E8%BF%910+%5B6%2Bf%28x%29%5D%2Fx%5E2%3D%3F%E7%AD%94%E6%A1%88%E6%98%AF36.)
已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.
已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.
已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.
f有二阶导数吧?条件要写全了,否则很难做题的.Taylor展式最简单,sin6x=6x-(6x)^3/6+小o(x^3),xf(x)=x(f(0)+f'(0)x+f''(0)/2x^2+小o(x^2))=xf(0)+x^2f'(0)+0.5x^3f''(0)+小o(x^3),于是由条件知
f(0)+6=0,f'(0)=0,.-36+0.5f''(0)=0,f(0)=-6,f'(0)=0,f''(0)=72,(6+f(x))/x^2=【6+f(0)+xf'(0)+0.5x^2f''(0)+小o(x^2)】/x^2=36+小o(1),极限是36
已知{limx趋近0 [（sin6x）+xf(x)]/x^3}=0 求limx趋近0 [6+f(x)]/x^2=?答案是36.
已知limx趋近0 [6+f(x)]/x^2=36,求limx趋近0 [（sin6x）+xf(x)]/x^3=?求详细解答
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