\(\frac{2016+2017x2018}{2017x2019-1}\) rút gọn phân số
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\(\frac{2016+2017.2018}{2017.2019-1}\)
\(=\frac{\left(2016+1\right)+2017.2018-1}{2017.2019-1}\)
\(=\frac{2017+2017.2018-1}{2017.2019-1}\)
\(=\frac{2017.\left(1+2018\right)-1}{2017.2019-1}\)
\(=\frac{2017.2019-1}{2017.2019-1}=1\)
\(\frac{2016+2017\times2018}{2017\times2019-1}\)
\(=\frac{2016+2017\times2018}{2017\times\left(2018+1\right)-1}\)
\(=\frac{2016+2017\times2018}{2017\times2018+2017-1}\)
\(=\frac{2016+2017\times2018}{2017\times2018+2016}\)
\(=1\)
__CHÚC BN HOK TỐT__
Ta có:
\(A=\frac{2017\cdot2018-1}{2017\cdot2018-2}\)
\(A=\frac{2017\cdot2018-2+1}{2017\cdot2018-2}\)
\(A=\frac{2017\cdot2018-2}{2017\cdot2018-2}+\frac{1}{2017\cdot2018-2}\)
\(A=1+\frac{1}{2017\cdot2018-2}\)
Ta có phân số trung gian là 1. Ta có:
\(A>1\) ; \(B< 1\)
\(\Rightarrow A>1>B\)
\(\Rightarrow A>B\)
Vậy A>B
Chúc em học tốt!
\(\Rightarrow\text{❤️✔✨♕✨✔️❤ }\Leftarrow\)
\(\text{Ta có :}\)
\(A=\frac{2017\cdot2018-1}{2017\cdot2018-2}=\frac{4070305}{4070304}=1\frac{1}{4070304}\)
\(B=\frac{2017}{2018}\)
\(\text{Vì : }1\frac{1}{4070304}>1\text{ mà }\frac{2017}{2018}< 1\text{ nên }1\frac{1}{4070304}>\frac{2017}{2018}\)
\(\Rightarrow A>B\)
Ta có :
2018 x 2018 = ( 2017 + 1 ) x ( 2019 - 1 )
= ( 2017 + 1 ) x 2019 - ( 2017 + 1 )
= 2017 x 2019 + 2019 - 2017 - 1
= 2017 x 2019 + 1 > 2017 x 2019
\(\Rightarrow\frac{2018\times2018}{2017\times2019}=\frac{2017\times2019+1}{2017\times2019}=1+\frac{1}{2017\times2019}>1\)
Vậy ta chọn B
~~Học tốt~~
\(=\dfrac{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2016}}{\left(\dfrac{2015}{2}+1\right)+...+\left(\dfrac{2}{2015}+1\right)+\left(\dfrac{1}{2016}+1\right)+1}\)
\(=\dfrac{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{2016}}{\dfrac{2017}{2}+\dfrac{2017}{3}+...+\dfrac{2017}{2015}+\dfrac{2017}{2016}}=\dfrac{1}{2017}\)
= 1 nhé bạn
\(\frac{2016+2017.2018}{2017.2019-1}\)
= \(\frac{2016+2017.2018}{2017.2018+2017-1}\)
= \(\frac{2016+2017.2018}{2017.2018+2016}\)
= 1