Question

Aratati ca : $\frac{ k^{2}-k+1 }{k ^{4} +k} = \frac{1}{ k^{2} +k}$

Answer 1

( k² - k + 1) / k· ( k³ + 1) = ( k² - k + 1)  / k · ( k +1) · ( k² - k + 1) = 
 = se simplifica  = 1 / k · ( k +1 ) = 1 / ( k² + k)