Помогите упростить пример, очень нужно
[tex]\frac{a-b}{a^{2}+ab+b^{2}} *\frac{a^{3}-b^{3}}{b^{2}-a^{2}}:(1-\frac{1+b}{b})[/tex]
[tex]\frac{a-b}{a^{2}+ab+b^{2}} *\frac{a^{3}-b^{3}}{b^{2}-a^{2}}:(1-\frac{1+b}{b})[/tex]
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