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Rozwiąż każdy układ równań czterema sposobami. Daję naj. a) 7x-5y=2 -4x+3y=9 b) 2,5x+3,2=6 5x+6y=4 c) -x -2y=-18 x+ 3y=3 d) 3x-y=6 x+2y=1


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