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\(\dfrac{423134.846267-423133}{846267.423133+423134}.\)
\(=\dfrac{\left(423133+1\right).846267-423133}{846267.423133+423134}.\)
\(=\dfrac{423133.846267+\left(846267-423133\right)}{846267.423133+423134}.\)
\(=\dfrac{423133.846267+423134}{846267.423133+423134}=1.\)
Vậy..........
\(\frac{423134.846267-423133}{846267.423133+423134}=\frac{\left(423134+1\right).846267-423133}{846267.423133+423134}\)
\(\frac{423133.846267+846267-423133}{846267.423133-423134}=\frac{423133.846267-423134}{864267.423133-423134}=1\)
\(=\frac{\left(423133+1\right).846267-423133}{846267.423133+423134}=\frac{846267.423133+846267-423133}{846267.423133+423134}=\)
\(=\frac{846267.423133+423134}{846267.423133+423134}=1\)
\(A=\frac{101+100+99+98+..+3+2+1}{101-100+99-98+..+3-2+1}=\frac{101\times\frac{102}{2}}{1+1+..+1}=\frac{101\times102}{2\times51}=101\)
\(B=\frac{423134.846267-423133}{423133.846267+423134}=\frac{423134^2+423134.423133-423133}{423133^2+423133.423134+423134}=\frac{423134^2+423133^2}{423134^2+423133^2}=1\)
\(\frac{423134.846267-423133}{846267.423133+423134}\)
Xét tử số : 423134.846267-423133
= (423133+1).846267-423133
= 423133.846267+846267-423133
=423133.846267+ 423134
Ta có : \(\frac{423133.846267+423134}{846267.423133+423134}\)=1
= 1 100% bởi vì đó là tính nhanh
ks mình