[b]Упростить[/b]
[tex]\frac{a^3+b^3}{(a+b)(a^2-b^2)}+\frac{2b}{a+b}[/tex]
[tex]\frac{a^3+b^3}{(a+b)(a^2-b^2)}+\frac{2b}{a+b}[/tex]
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