Используяя формулу (а+б) * (а-б)=а²-б² , вычислите 79*81
79*81=(80-1)*(80+1)=80^2-1^2=6400-1=6399
79*81
(80-1)*(80+1)=80²-1²=6400-1=6399
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79*81=(80-1)*(80+1)=80^2-1^2=6400-1=6399
79*81
(80-1)*(80+1)=80²-1²=6400-1=6399