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tathuy2345

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sonsac99

nguyen ham nha

[TEX]I=\int\frac{1}{x(x^3+1)}dx[/TEX]

[TEX]I=\int\frac{x^2}{x^3(x^3+1)}dx[/TEX]

Dat [TEX]t=x^3+1 \Rightarrow dt= 3x^2dx[/TEX]

[TEX]I=\frac{1}{3}\int\frac{dt}{(t-1)t}[/TEX]

toi day tu giai tiep nha
 
S

sonsac99

ngyen ham

[TEX]I=\int\frac{x}{x^4+x^2+1}dx[/TEX]

dat [TEX]t=x^2 \Rightarrow dt=2xdx[/TEX]

[TEX]I=\frac{1}{2}\int\frac{dt}{t^2+t+1}[/TEX]

toi day don gjan oy nek
 
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