Umieść w kratkach odpowiednie wyrażenia:
http://img849.imageshack.us/img849/2323/gimplus.png
-7x-3 2 -5x-5
-x-1 -4x-2 -2x-4
-3x-1 -3x+1
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-7x-3 2 -5x-5
-x-1 -4x-2 -2x-4
-3x-1 -3x+1