August 2018 2 44 Report
Zapis krócej (licz sprytnie)

a) -17x - 15x - 13x - 10x + 10x + 13x + 15x + 17x =
b) -10x - 8x - 6x - 2x + 2x + 4x + 6x + 8x =
c) -123x + 55x - 39x + 23x - 155x + 239x =
d) 439x - 427x + 369x - 357x + 229x - 217x =



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