\(M=\frac{10^{2015}+1}{10^{2016}+1}\)
\(N=\frac{10^{2016}+1}{10^{2017}+1}\)
So \(M\) với \(N\)
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1/ ta có:
A = \(\frac{10^{2015}+1}{10^{2016}+1}\Rightarrow10A=\frac{10^{2016}+10}{10^{2016}+1}=1+\frac{9}{10^{2016}+1}\)
B = \(\frac{10^{2016}+1}{10^{2017}+1}\Rightarrow10B=\frac{10^{2017}+10}{10^{2017}+1}=1+\frac{9}{10^{2017}+1}\)
vì \(\frac{9}{10^{2016}+1}>\frac{9}{10^{2017}+1}\) => 10A > 10B
=> A > B
vậy A > B
2/ ta có: M = 5 + 52 + 53 + ... + 52016
=> 5M = 52+53+54+...+52017
=> 5M - M = (52+53+54+...+52017) - (5+52+53+...+52016)
=> 4M = 52017- 5
=> M = \(\frac{5^{2017}-5}{4}\)
vậy M = \(\frac{5^{2017}-5}{4}\)
Áp dung công thức \(a>b\Leftrightarrow\frac{a}{b}>\frac{a+m}{b+m}\)
\(B=\frac{10^{2017}+1}{10^{2016}+1}>\frac{10^{2017}+1+9}{10^{2016}+1+9}=\frac{10^{2017}+10}{10^{2016}+10}=\frac{10\left(10^{2016}+1\right)}{10\left(10^{2015}+1\right)}=\frac{10^{2016}+1}{10^{2015}+1}=A\)
\(\Leftrightarrow B>A\)
\(N=\frac{6}{10^{2015}}+\frac{8}{10^{2016}}=M=\frac{8}{10^{2015}}+\frac{6}{10^{2016}}\)
Hk tốt
k nhé
Ta có :N= \(\frac{6}{10^{2015}}+\frac{8}{10^{2016}}=\frac{6}{10^{2015}}+\frac{6}{10^{2016}}+\frac{2}{10^{2016}}\)
M=\(\frac{8}{10^{2015}}+\frac{6}{10^{2016}}=\frac{6}{10^{2015}}+\frac{6}{10^{2016}}+\frac{2}{10^{2015}}\)
Ta Xét: \(\frac{2}{10^{2016}},\frac{2}{10^{2015}}\)
Vì 102016>102015
Nên: \(\frac{2}{10^{2016}}< \frac{2}{10^{2015}}\)
Do đó : N<M
Ta có : \(A=\frac{10^{2016}-1}{10^{2017}-11}\)
\(\Leftrightarrow10.A=\frac{10.\left(10^{2016}-1\right)}{10^{2017}-11}=\frac{10^{2017}-10}{10^{2017}-11}\)
\(=\frac{10^{2017}-11+1}{10^{2017}-11}=1+\frac{1}{10^{2017}-11}\)
Lại có : \(B=\frac{10^{2016}+1}{10^{2017}+9}\)
\(\Leftrightarrow10.B=\frac{10\left(10^{2016}+1\right)}{10^{2017}+9}=\frac{10^{2017}+10}{10^{2017}+9}\)
\(=\frac{10^{2017}+9+1}{10^{2017}+9}=1+\frac{1}{10^{2017}+9}\)
Do : \(10^{2017}-11< 10^{2017}+9\) \(\Rightarrow\frac{1}{10^{2017}-11}>\frac{1}{10^{2017}+9}\)
\(\Rightarrow1+\frac{1}{10^{2017}-11}>1+\frac{1}{10^{2017}+9}\)
hay \(A>B\)
Vậy : \(A>B\)
Ta có :
\(A=\frac{10^{2016}+1}{10^{2015}+1}=\frac{\left(10^{2016}+1\right).10}{\left(10^{2015}+1\right).10}=\frac{10^{2017}+10}{10^{2016}+10}=\frac{10^{2017}+10}{10^{2016}+10}\)
Vì \(10^{2017}=10^{2017}\)và \(10>1\)nên \(10^{2017}+10>10^{2017}+1\)( 1 )
Vì \(10^{2016}=10^{2016}\)và \(10>1\)nên \(10^{2016}+10>10^{2016}+1\)( 2 )
Từ ( 1 ) và ( 2 ) , suy ra : \(\frac{10^{2017}+10}{10^{2016}+10}>\frac{10^{2017}+1}{10^{2016}+1}\)
Vậy \(A>B\)
\(B=\frac{10^{2016}+1}{10^{2017}+1}=\frac{10^{2016}+1+9}{10^{2017}+1+9}=\frac{10^{2016}+10}{10^{2017}+10}=\frac{10.\left(10^{2015}+1\right)}{10.\left(10^{2016}+1\right)}=\frac{10^{2015}+1}{10^{2016}+1}\)
lm tương tự vs B ta có
\(A=\frac{10^{2015}+1}{10^{2014}+1}\)
suy ra A>B
M > N