a² * ( 2a + 3 ) * ( a² - a ) = ( 2a³ + 3a² ) * ( a² - a ) =
= 2a⁵ - 2a⁴ + 3a⁴ - 3a³ = 2a⁵ + a⁴ - 3a³.
a² * ( 2a + 3 ) * ( a² - a ) = ( 2a³ + 3a² ) * ( a² - a ) =
= 2a⁵ - 2a⁴ + 3a⁴ - 3a³ = 2a⁵ + a⁴ - 3a³.