若极限lim(x-0)[sin6x+xf(x)]\/x^3=0,则lim(x-0)[6+f(x)]\/x^2=?
简单计算一下即可,答案如图所示
lim(x趋近于0)[sin6x+xf(x)]\/x^3=0,则lim(x趋近于0)[6+f(x)]\/x^2=?
,lim(x趋近于0)[sin6x+xf(x)]\/x^3=0,则知道f(x) 是低天X^2的。所以(6+F(X))是低于X^2的。从而 lim(x趋近于0)[6+f(x)]\/x^2=0.
lim x→0 [sin6x+xf(x)]\/x^3=0,求 lim x→0 [6+f(x)]\/x^2
因为lim x→0 [sin6x\/(6x)]=1 所以,lim x→0 [sin6x+xf(x)]\/x^3 =lim x→0 [6x+xf(x)]\/x^3 =lim x→0 [6+f(x)]\/x^2 =0
...sin6x+xf(x)]\/x^3=0, 求 lim x→0 [6+f(x)]\/x^2?
lim x→0 [sinx-x]\/x^3,如果按照你的那种做法,显然结果是0。实际上答案是-1\/6.此处应用的是一个很重要的公式——泰勒公式(只展开有限项目,后边的高阶项可视为高阶无穷小)sinx=x-1\/6*x^3.回到你的这道题,lim [sin6x+xf(x)]\/x^3=0 也就是 lim[6x-1\/6*(6x)^3+xf(x)...
...sin6x+xf(x)]\/x^3=0, 求 lim x→0 [6+f(x)]\/x^2?
简单计算一下即可,答案如图所示
若lim [sin6x+xf(x)]\/x^3=0,则lim [6+f(x)]\/x^2是多少? (x是趋近0)
lim [sin6x+xf(x)]\/x^3=0,则lim [6+f(x)]\/x^2是36(x是趋近0)(x→0)lim[sin6x+xf(x)]\/x^3=0 属于0-0型,可以应用洛必答法则:(x→0)lim[6cos6x+f(x)+xf'(x)]\/(3x^2)=0 (x→0)lim[-36sin6x+f'(x)+f'(x)+xf''(x)]\/(6x)=0 (x→0)lim[-216cos...
求极限当x→0若lim[sin6x+x f(x)]\/x^3=0,求lim[6+ f(x)]\/x^2_百度知...
首先sin6x~6x并没错,但是(sin6x+xf(x))~(6x+xf(x)),"~"这个符号只对整个分子和分母有效,而部分分子或部分分母用的时候可能会出现错误,这题应该用洛必达法则上下求导
求极限当x→0若lim[sin6x+x f(x)]\/x3=0,求lim[6+ f(x)]\/x2
代入得到 lim[sin6x+xf(x)]\/x^3=6x-(6x)^3\/3!+o(x^3)+f(0)x+f'(0)x^2+1\/2f''(0)x^3+o(x^3)\/x^3=0 x→0 整理得lim[6x+f(0)x+f'(0)x^2]\/x^3+1\/2f''(0)-36=0 从而f(0)=-6 f'(0)=0 1\/2f''(0)-36=0 f''(0)=72 lim[6+ f(x)]\/x^2=...
若limx趋近于0,(sin6x+xf(x))\/x^3=0,求limx趋近于0,(6+f(x))\/x^2...
lim x→0,[sin6x + xf(x)]\/x³=0+α,其中lim x→0,α=0 即f(x)\/x² = -sin6x\/x³ + α 从而lim x→0,[6+f(x)]\/x²=lim x→0,( 6\/x² - sin6x\/x³ + α )=lim x→0,(6x-sin6x)\/x³,用洛必达法则 =lim x→0,[...
lim (sin6x+xf(x))\/x^3=0 则lim(6+f(x))\/x^2=? x->0;初学者 求详细过程...
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