5x(2x - 3) - 2.5x(4x - 2) = 10x² - 15x - 10x² + 5x = -10x = -10 · (-0.01) = 0.1
12(2 - p) + 29p - 9(p + 1) = 24 - 12p + 29p - 9p - 9 = 15 + 8p = 15 + 8 · 1/4 = 15 + 2 = 17
5a(a² - 4a) - 4a(a² - 5a) = 5a³ - 20a² - 4a³ + 20a² = a³ = (-3)³ = -27
3(3d - 1) + 7(2d + 1) = 9d - 3 + 14d + 7 = 23d + 4 = (2 + 4/23) · 23 + 4 = 46 + 4 + 4 = 54
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Пункт (а)
5x(2x - 3) - 2.5x(4x - 2) = 10x² - 15x - 10x² + 5x = -10x = -10 · (-0.01) = 0.1
Пункт (б)
12(2 - p) + 29p - 9(p + 1) = 24 - 12p + 29p - 9p - 9 = 15 + 8p = 15 + 8 · 1/4 = 15 + 2 = 17
Пункт (в)
5a(a² - 4a) - 4a(a² - 5a) = 5a³ - 20a² - 4a³ + 20a² = a³ = (-3)³ = -27
Пункт (г)
3(3d - 1) + 7(2d + 1) = 9d - 3 + 14d + 7 = 23d + 4 = (2 + 4/23) · 23 + 4 = 46 + 4 + 4 = 54