Zadanie 1
[tex] - (2x - y) - 2x = - 2x + y - 2x = - 4x + y[/tex]
[tex]( - 2m + 4) + (m - 0.5m) = - 2m + 4 + m - 0.5m = - m + 4 - 0.5m = - 1.5m + 4[/tex]
Zadanie 2
[tex] - 4a( \frac{1}{4} - a) = - a + 4 {a}^{2} [/tex]
[tex]5x(3x + y - 1) = 15 {x}^{2} + 5xy - 5x[/tex]
Zadanie 3
[tex](9 {p}^{2} - 8pr) \div ( - 2) = - \frac{9 {p}^{2} - 8pr }{2} = \frac{8pr - 9 {p}^{2} }{2} [/tex]
[tex] \frac{3 - 6x}{3} - \frac{21 - 14x}{7} = \frac{3(1 - 2x)}{3} - \frac{7(3 - 2x)}{7} = 1 - 2x - (3 - 2x) = 1 - 2x - 3 + 2x = - 2[/tex]
