Wzorem skróconego mnożenia oblicz 82*78
a²-b²=(a-b)(a+b) - różnica kwadratów
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82*78=(80+2)*(80-2)=80²-2²=6400-4=6396
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a²-b²=(a-b)(a+b) - różnica kwadratów
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82*78=(80+2)*(80-2)=80²-2²=6400-4=6396