so sánh phân số A= $\frac{54.107-53}{53.107+54}$ và B=$\frac{135.269-133}{134.269+135}$ 25/08/2021 Bởi Eva so sánh phân số A= $\frac{54.107-53}{53.107+54}$ và B=$\frac{135.269-133}{134.269+135}$
$\begin{array}{l}\quad A=\dfrac{54.107-53}{53.107+54}\\\to A=\dfrac{(53+1).107-53}{53.107+54}\\\to A=\dfrac{53.107+107-53}{53.107+54}\\\to A=\dfrac{53.107+54}{53.107+54}\\\to A=1\quad(1)\\\quad B=\dfrac{135.269-133}{134.269+135}\\\to B=\dfrac{(134+1).269-133}{134.269+135}\\\to B=\dfrac{134.269+269-133}{134.269+135}\\\to B=\dfrac{134.269+136}{134.269+135}\\\to B>1\quad(2)\\\text{- Từ (1) và (2) $\to A<B$}\\\text{- Vậy $A<B$} \end{array}$ Bình luận
xin ctlhn
$\begin{array}{l}\quad A=\dfrac{54.107-53}{53.107+54}\\\to A=\dfrac{(53+1).107-53}{53.107+54}\\\to A=\dfrac{53.107+107-53}{53.107+54}\\\to A=\dfrac{53.107+54}{53.107+54}\\\to A=1\quad(1)\\\quad B=\dfrac{135.269-133}{134.269+135}\\\to B=\dfrac{(134+1).269-133}{134.269+135}\\\to B=\dfrac{134.269+269-133}{134.269+135}\\\to B=\dfrac{134.269+136}{134.269+135}\\\to B>1\quad(2)\\\text{- Từ (1) và (2) $\to A<B$}\\\text{- Vậy $A<B$} \end{array}$