so sánh 2017^99+1/2017^100+1 và 2017^100+1/2007^101+1
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Ta có: \(A=\frac{2017^{99}+1}{2017^{100}+1}\Rightarrow2017A=\frac{2017^{100}+2017}{2017^{100}+1}=1+\frac{2016}{2017^{100}+1}\)
\(B=\frac{2017^{100}+1}{2017^{101}+1}\Rightarrow2017B=\frac{2017^{101}+2017}{2017^{101}+1}=1+\frac{2016}{2017^{101}+1}\)
\(\frac{2016}{2017^{100}+1}>\frac{2016}{2017^{101}+1}\Rightarrow1+\frac{2016}{2017^{100}+1}>1+\frac{2016}{2017^{101}+1}\)
\(\Rightarrow2017A>2017B\Rightarrow A>B\)
Vậy...
Đặt \(A=\frac{2017^{99}+1}{2017^{100}+1}\)nên \(2017A=\frac{2017^{100}+2017}{2017^{100}+1}=\frac{2017^{100}+1+2016}{2017^{100}+1}=1+\frac{2016}{2017^{100}+1}\)
\(B=\frac{2017^{100}+1}{2017^{101}+1}\)nên \(2017B=\frac{2017^{101}+2017}{2017^{101}+1}=\frac{2017^{101}+1+2016}{2017^{101}+1}=1+\frac{2016}{2017^{101}+1}\)
Vì \(1=1;\frac{2016}{2017^{100}+1}>\frac{2016}{2017^{101}+1}\Rightarrow1+\frac{2016}{2017^{100}+1}>1+\frac{2016}{2017^{101}+1}\)
Hay \(2017A>2017B\)nên \(A>B\)
Vây \(\frac{2017^{99}+1}{2017^{1001}+1}>\frac{2017^{100}+1}{2017^{101}+1}\)
vì 2017100 + 1 < 2017101 + 1
\(\Rightarrow\frac{2017^{100}+1}{2017^{101}+1}< \frac{2017^{100}+1+2016}{2017^{101}+1+2016}=\frac{2017^{100}+2017}{2017^{101}+2017}=\frac{2017.\left(2017^{99+1}\right)}{2017.\left(2017^{100}+1\right)}=\frac{2017^{99}+1}{2017^{100}+1}\)
Vậy \(\frac{2017^{99}+1}{2017^{100}+1}>\frac{2017^{100}+1}{2017^{101}+1}\)
so sánh 2 phân số cùng mẫu thì ta xét tử
đừng nói không làm được chứ
\(A=\frac{2017^{99}}{2017^{100}-2}\)
=> \(2017A=\frac{2017^{100}}{2017^{100}-2}=\frac{2017^{100}-2+2}{2017^{100}-2}=1+\frac{2}{2017^{100}-2}\)
\(B=\frac{2017^{100}}{2017^{101}-2}\)
=>\(2017B=\frac{2017^{101}}{2017^{101}-2}=\frac{2017^{101}-2+2}{2017^{101}-2}=1+\frac{2}{2017^{101}-2}\)
Do \(\frac{2}{2017^{100}-2}>\frac{2}{2017^{101}-2}\)
Nên 2017A > 2017B
Vậy A > B
ta có :
\(25^{1008}=\left(5^2\right)^{1008}=5^{2.1008}=5^{2016}\)
mà \(5^{2017}>5^{2016}\)
\(\Rightarrow\)\(5^{2017}>\left(5^2\right)^{1008}\)
\(\Rightarrow\)\(5^{2017}>25^{1008}\)
có \(5^{2017}=\left(5^2\right)^{1008}\times5\)\(=25^{1008}\times5\)
mà \(=25^{1008}\times5\)> \(25^{1008}\)
nên \(5^{2017}>25^{1008}\)
So sánh
2017^2013 + 3 / 2017^2016 + 1 và 2017^2018 + 3 / 2017^2007 + 1
Mọi người ơi " / " là phần nha