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Znatok57
@Znatok57
June 2022
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вычислите наиболее рациональным способом:1) 86(в квадрате) - 14(в квадрате);2) (3 целых 2/3 в квадрате) - (2 целых 1/5 в квадрате)
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gaidukova97
86^2-14^2=(86-14)*(86+14)= 72*100=7200
(3 2/3)^2-(2 1/5)^2= (3 2/3- 2 1/5)*(3 2/3+ 2 1/5)=22/15*88/15= 1936/225=8 целых 136/225
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(3 2/3)^2-(2 1/5)^2= (3 2/3- 2 1/5)*(3 2/3+ 2 1/5)=22/15*88/15= 1936/225=8 целых 136/225