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a)1,5 x 1,5= 2,25 x 1,5 =3,375
b)-2 x -2 x -2 x -2 x-2 x -2= 4 x -2 x -2 x -2 x -2=-8 x (tu trzy ,,minusdwa'')=16 x -2 x -2= -32 x -2 = końcowy wynik =64.