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Danaatachanova
@Danaatachanova
July 2022
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применяя формулу (а-b)(a+b)=a2-b2 решить:
1)79×81
срочно
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manyny06
Verified answer
79 * 81 = (80-1) (80+1) = 80² - 1² = 6400 - 1 = 6399
1 votes
Thanks 1
popricon
79+1*80-1=80^2*1*2=6399
0 votes
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Answers & Comments
Verified answer
79 * 81 = (80-1) (80+1) = 80² - 1² = 6400 - 1 = 6399