a^2+ab-12b^2=a...

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July 2022 1 13 Report

докажите тоджество:
a^3+6a^2b+5ab^2/a^2+9ab+20b^2/a^2-2ab-3b^2/a^2+ab-12b^2=a

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eVa74 $\frac{a(a+1)(a+5)}{(a+5)(a+4)}* \frac{(a-3)(a+4)}{(a-3)(a+1)}=a 


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