Odpowiedź:
a)
[tex] {a}^{2} - 2a + 2 {a}^{2} - a - 1 = 3 {a}^{2} - 3a - 1[/tex]
b)
[tex] - 3 {a}^{2} + 5 - 2( {a}^{2} - 2a) = - 3 {a}^{2} + 5 - 2 {a}^{2} + 4a = - 5 {a}^{2} + 4a + 5[/tex]
c)
[tex]( {a}^{2} - 2a + ( - 3 {a}^{2} + 5)) - (2 {a}^{2} - a - 1) = {a}^{2} - 2a - 3 {a}^{2} + 5 - 2 {a}^{2} + a + 1 = - 4 {a}^{2} - a + 6[/tex]
d)
[tex]( {a}^{2} - 2a) ( - 3 {a}^{2} + 5) = - 3 {a}^{4} + 5 {a}^{2} + 6 {a}^{3} - 10a[/tex]
