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12x13-6x2x13
12x13-12x13
12x(13-12)
=12
13x49-26x27
13x49-13x2x27
13x49-54x13
13x(49-54)
13x-5=-65
57 do kwadratu - 57 x 55
57 x 57 - 57 x 55
57x (57-55) = 114