急求解4道关于极限的题目
1.lim(1/(x+1)-3/(x^3+1))(x趋向于-1)2.lim((1-cos3x)/x^2)(x趋向于0)3lim(((1+3x)/3x)^-2)(x趋向于无...
1.lim(1/(x+1)-3/(x^3+1)) (x趋向于-1)
2.lim((1-cos3x)/x^2) (x趋向于0)
3lim(((1+3x)/3x)^-2) (x趋向于无穷大)
4.lim((1-3x)^(1/x)) (x趋向于0)
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2.lim((1-cos3x)/x^2) (x趋向于0)
3lim(((1+3x)/3x)^-2) (x趋向于无穷大)
4.lim((1-3x)^(1/x)) (x趋向于0)
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第一题通分,第二题用等价无穷小替换,第三四题用重要极限。过程太难输入,你再问问身边的同学老师吧
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-3
2
-1
e^3
2
-1
e^3
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lim[1/(x+1)-3/(x^3+1)] (x趋向于-1)
=lim[(x^2-x+1)/(x^3+1)-3/(x^3+1) ](x趋向于-1)
=lim[(x^2-x-2)/(x^3+1)](x趋向于-1)
=lim{(x-2)(x+1)/[(x+1)(x^2-x+1)]}(x趋向于-1)
=lim(x-2)/(x^2-x+1)(x趋向于-1)
=(-1-2)/(1+1+1)
=-1
lim[(1-cos3x)/x^2] (x趋向于0)
=lim2[sin(3x/2)]^2/x^2] (x趋向于0)
=lim2(3x/2)]^2/x^2] (x趋向于0)
=9/2
lim[(1+3x)/3x]^(-2) (x趋向于无穷大)
=lim[(1+1/(3x)]^(-2) (x趋向于无穷大)
=[(1+0]^(-2)
=1
lim[(1-3x)^(1/x)] (x趋向于0)
=lim{(1-3x)^[1/(-3x)]}^(-3) (x趋向于0)
=e^(-3)
=lim[(x^2-x+1)/(x^3+1)-3/(x^3+1) ](x趋向于-1)
=lim[(x^2-x-2)/(x^3+1)](x趋向于-1)
=lim{(x-2)(x+1)/[(x+1)(x^2-x+1)]}(x趋向于-1)
=lim(x-2)/(x^2-x+1)(x趋向于-1)
=(-1-2)/(1+1+1)
=-1
lim[(1-cos3x)/x^2] (x趋向于0)
=lim2[sin(3x/2)]^2/x^2] (x趋向于0)
=lim2(3x/2)]^2/x^2] (x趋向于0)
=9/2
lim[(1+3x)/3x]^(-2) (x趋向于无穷大)
=lim[(1+1/(3x)]^(-2) (x趋向于无穷大)
=[(1+0]^(-2)
=1
lim[(1-3x)^(1/x)] (x趋向于0)
=lim{(1-3x)^[1/(-3x)]}^(-3) (x趋向于0)
=e^(-3)
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