Question

помогите с алгеброй(7 класс)​

Answer 1

$Big(dfrac{1}{1999}-dfrac{1}{2000}Big)^2=Big(dfrac{2000-1999}{1999cdot 2000}Big)^2=dfrac{1}{1999^2, cdot , 2000^2}\\\Big(dfrac{1}{2000}Big)^2cdot Big(dfrac{1}{1999}Big)^2=dfrac{1}{2000^2, cdot , 1999^2}\\\\dfrac{Big(dfrac{1}{1999}-dfrac{1}{2000}Big)^2}{Big(dfrac{1}{2000}Big)^2cdot Big(dfrac{1}{1999}Big)^2}=dfrac{2000^2, cdot , 1999^2}{1999^2, cdot , 2000^2} =1$