1.
[tex]a) \: 3.5 \times ( {a}^{2} + ab - 4) = \\ 3.5 {a}^{2} + 3.5ab - 14[/tex]
[tex]b) \: - 6x \times (x - xy + y) = \\ - 6 {x}^{2} + 6 {x}^{2} y - 6xy[/tex]
2.
[tex]a) \: 2a(4 + {a}^{2} ) - 3(4a - {a}^{2} ) + a( {a}^{2} - 1) = \\ 8a + 2 {a}^{3} - 12a + 3 {a}^{2} + {a}^{3} - a = \\ 3 {a}^{3 } + 3 {a}^{2} - 5a[/tex]
[tex]b) \: {a}^{2} (a - ab) - a( {b}^{2} - {a}^{2} b) = \\ {a}^{3 } - {a}^{3} b - a {b}^{2} + {a}^{3} b = \\ {a}^{3} - a {b}^{2} [/tex]
[tex]c) \: - \frac{1}{2} a( - 4 {b}^{2} - 2ab) = \\ 2a {b}^{2} + 2 {a}^{2} b[/tex]
liczę na naj :)
