Question

Zapisz w jak najprostszej postaci.
- (kx + ny) - (3kx + 2ny) + (5kx - 3ny)
(2ab + a + 3) - (3ab - a + 3)
(4x² - 3x) - (x + 0,1x²) - (x² - 0,1x)
abc - (abc - (- xyz - (xyz - abc)))
s²t - (st² - (s²t - (st² - s²t)))


na teraz jak mozna

Answer 1

- (kx + ny) - (3kx + 2ny) + (5kx - 3ny) = - kx - ny - 3kx - 2ny + 5kx - 3ny = - 6ny + kx
(2ab + a + 3) - (3ab - a + 3) = 2ab + a + 3 - 3ab + a - 3 = 2a - ab 
(4x² - 3x) - (x + 0,1x²) - (x² - 0,1x) = 4x² - 3x - x - 0,1x² - x² + 0,1x =  2,9x² - 3,9x 
abc - (abc - (- xyz - (xyz - abc))) = abc - (abc - ( - xyz -xyz + abc)) = abc - (abc +xyz + xyz - abc) = abc - abc - xyz - xyz + abc = abc -2xyz
s²t - (st² - (s²t - (st² - s²t))) = s²t - st² + s²t - st² + s²t = 3s²t - 2st²