Б) 1,25с + 2с + (-0,85с) - (-3с) – 3с = 1,25c + 2c + 0,85c + 3c - 3c = 6,1c
в) (11/21)х – (2/21)х – (19/21)х + (5/21)х = (11/21 - 2/21 - 19/21 + 5/21)x = ( (11-2-19+5) / 21)x = (-5/21)x
Б) 1,25с + 2с + (-0,85с) - (-3с) – 3с = 1,25c + 2c + 0,85c + 3c - 3c = 6,1c
в) (11/21)х – (2/21)х – (19/21)х + (5/21)х = (11/21 - 2/21 - 19/21 + 5/21)x = ( (11-2-19+5) / 21)x = (-5/21)x