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(ab+4a)-(b-1)2a=(ab+4a)-2ab-2a=-ab+2a
odp. b
ab + 4a - (b - 1)2a = ab + 4a - 2ab + 2a = - ab + 6a
odp c
zad 2
- 8a²b + 4ab² - 4ab = 4ab( - 2a + b - 1)
odp c