Question

Сделайте плиз))))))))))

Answer 1

$frac{ {a}^{3} - {b}^{3} }{ {a}^{4} - {b}^{4} } = frac{(a - b)( {a}^{2} + ab + {b}^{2}) }{( {a}^{2} - {b}^{2} )( {a}^{2} + {b}^{2} )} = frac{ {a}^{2} + ab + {b}^{2} }{(a + b)( {a}^{2} + {b}^{2}) }$