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Ta có: \(A=\frac{2017^{100}}{1+2017+2017^2+2017^3+...+2017^{100}}\)
\(\Leftrightarrow A=\frac{\left[\left(20.100\right)+16+1\right]^{100}}{1+2017+2017^2+2017^3+...+2017^{10}}\)
\(B=\frac{2016^{100}}{1+2016+2016^2+2016^3+...+2016^{100}}\)
\(\Leftrightarrow B=\frac{\left[\left(20.100+16\right)\right]^{100}}{1+2016+2016^2+2016^3+...+2016^{100}}\)
Ta có hai tổng A và B mới để so sánh:
\(A=\frac{\left[\left(20.100\right)+16+1\right]^{100}}{1+2017+2017^2+2017^3+...+2017^{100}}\)
\(B=\frac{\left[\left(20.100\right)+16\right]^{100}}{1+2016+2016^2+2016^3+...+2016^{100}}\)
Tới đây đơn giản rồi. Bạn làm tiếp đi nhé! Mẹ mình bắt tắt máy không cho làm nên đành dừng lại ở đây thôi! Thông cảm :V
\(\frac{100^{2015}+1}{100^{2015}+1}=1\)
\(\frac{100^{2016}+1}{100^{2016}+1}=1\)
Vì 1 = 1 nên \(\frac{100^{2015}+1}{100^{2015}+1}=\frac{100^{2016}+1}{100^{2016}+1}\)
à mình nhìn nhầm đề
Mình giải nha
Đặt \(A=\frac{100^{2015}+1}{100^{2005}+1}\Rightarrow\frac{A}{100^{10}}=\frac{100^{2015}+1}{100^{2015}+100^{10}}=\frac{100^{2015}+100^{10}-999}{100^{2015}+100^{10}}=1-\frac{999}{100^{2015}+100^{10}}\)
Đặt \(B=\frac{100^{2016}+1}{100^{2006}+1}\Rightarrow\frac{B}{100^{10}}=\frac{100^{2016}+100^{10}-999}{100^{2016}+100^{10}}=1-\frac{999}{100^{2016}+100^{10}}\)
\(1-\frac{999}{100^{2015}+100^{10}}< 1-\frac{999}{100^{2016}+100^{10}}\Rightarrow A< B\)
So sánh A và B
\(A=\frac{100^{2015}+1}{100^{2014}+1}\)
\(B=\frac{100^{2016}+1}{100^{2015}+1}\)
Gấp nha!
Ta có:
B>\(\frac{100^{2016}+1+99}{100^{2015}+1+99}\)=\(\frac{100^{2016}+100}{100^{2015}+100}\)=\(\frac{100\left(100^{2016}+1\right)}{100\left(100^{2015}+1\right)}\)=\(\frac{100^{2015}+1}{100^{2014}+1}\)=A
Vậy B>A
\(100A=\dfrac{100^{2016}+100}{100^{2016}+1}=1+\dfrac{99}{100^{2016}+1}\)
\(100B=\dfrac{100^{2017}+100}{100^{2017}+1}=1+\dfrac{99}{100^{2017}+1}\)
mà \(100^{2016}< 100^{2017}\)
nên A>B
a/ Ta có
\(200-\left(3+\frac{2}{3}+\frac{2}{4}+...+\frac{2}{100}\right)\)
\(=1+2\left(1-\frac{1}{3}\right)+2\left(1-\frac{1}{4}\right)+...+2\left(1-\frac{1}{100}\right)\)
\(=1+2\left(\frac{2}{3}+\frac{3}{4}+...+\frac{99}{100}\right)\)
\(=2\left(\frac{1}{2}+\frac{2}{3}+...+\frac{99}{100}\right)\)
Thế lại bài toán ta được:
\(\frac{200-\left(3+\frac{2}{3}+\frac{2}{4}+...+\frac{2}{100}\right)}{\frac{1}{2}+\frac{2}{3}+...+\frac{99}{100}}\)
\(=\frac{2\left(\frac{1}{2}+\frac{2}{3}+...+\frac{99}{100}\right)}{\frac{1}{2}+\frac{2}{3}+...+\frac{99}{100}}=2\)
b/ Ta có:
A - B\(=\frac{-21}{10^{2016}}+\frac{12}{10^{2016}}+\frac{21}{10^{2017}}-\frac{12}{10^{2017}}\)
\(=\frac{9}{10^{2017}}-\frac{9}{10^{2016}}< 0\)
Vậy A < B
Easy.
Ta có: Nếu \(\frac{a}{b}>1\)thì \(\frac{a}{b}>\frac{a+m}{b+m}\left(m>0\right)\) (bạn tự c/m)
Mặt khác,ta có: \(C=\frac{2016^{99}+1}{2016^{89}+1}=\frac{2016\left(2016^{99}+1\right)}{2016\left(2016^{89}+1\right)}\)
\(=\frac{2016^{100}+2016}{2016^{90}+2016}=\frac{\left(2016^{100}+1\right)+2015}{\left(2016^{90}+1\right)+2015}\)
Mà \(\frac{\left(2016^{100}+1\right)+2015}{\left(2016^{90}+1\right)+2015}>1\)
Nên \(C=\frac{\left(2016^{100}+1\right)+2015}{\left(2016^{90}+1\right)+2015}< \frac{2016^{100}+1}{2016^{90}+1}=B\)
Vậy \(B>C\)
Bài 1:
ta có: \(B=\frac{12}{\left(2.4\right)^2}+\frac{20}{\left(4.6\right)^2}+...+\frac{388}{\left(96.98\right)^2}+\frac{396}{\left(98.100\right)^2}\)
\(B=\frac{4^2-2^2}{2^2.4^2}+\frac{6^2-4^2}{4^2.6^2}+...+\frac{98^2-96^2}{96^2.98^2}+\frac{100^2-98^2}{98^2.100^2}\)
\(B=\frac{1}{2^2}-\frac{1}{4^2}+\frac{1}{4^2}-\frac{1}{6^2}+...+\frac{1}{96^2}-\frac{1}{98^2}+\frac{1}{98^2}-\frac{1}{100^2}\)
\(B=\frac{1}{2^2}-\frac{1}{100^2}\)
\(B=\frac{1}{4}-\frac{1}{100^2}< \frac{1}{4}\)
\(\Rightarrow B< \frac{1}{4}\)
Bài 2:
ta có: \(B=\frac{2015+2016+2017}{2016+2017+2018}\)
\(B=\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
mà \(\frac{2015}{2016}>\frac{2015}{2016+2017+2018}\)
\(\frac{2016}{2017}>\frac{2016}{2016+2017+2018}\)
\(\frac{2017}{2018}>\frac{2017}{2016+2017+2018}\)
\(\Rightarrow\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}>\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
\(\Rightarrow A>B\)
Học tốt nhé bn !!
Ta có:
A=100^2015+1/100^2016+1 suy ra 100A=100^2016+100/100^2016+1=100^2016+1+99/100^2016+1=1/99/100^2016+1
Lại có
B=100^2016+1/100^2017+1 suy ra 100B=100^2017+100/100^2017+1=100^2017+1+99/100^2017+1=1/99/100^2017+1
Vì1/99/100^2016+1>1/99/100^2017+1 suy ra A>B
thanks you!