So sánh A= √2014 + √2016 và B= 2√2016
so sánh A và B biết :
A= 2016^2015+1 / 2016^2014+1 và B = 2016^2014+1 / 2016^2013+1
giúp mk nhé mọi người
A = 2016^2015 +1 / 2016^2014+1 < 2016^2015 + 1 + 2015 / 2016^2014 + 1 + 2015
= 2016^2015 + 2016 / 2016^2014 + 2016
= 2016(2016^2014 + 1 ) / 2016(2016^2013 +1)
= 2016^2014 + 1 / 2016^2013 + 1 = B
=> A < B
so sánh A=10^2014+2016/10^2015+2016 và B=10^2015+2016/10^2016+2016
Xét \(A=\frac{10^{2014}+2016}{10^{2015}+2016}\Rightarrow10A=\frac{10^{2015}+20160}{10^{2015}+2016}=\frac{10^{2015}+2016+18144}{10^{2015}+2016}=1+\frac{18144}{10^{2015}+2016}\)
Xét \(B=\frac{ 10^{2015}+2016}{10^{2016}+2016}\Rightarrow10B=\frac{10^{2016}+20160}{10^{2016}+2016}=\frac{10^{2016}+2016+18144}{10^{2016}+2016}=1+\frac{18144}{10^{2016}+2016}\)
Có \(\frac{18144}{10^{2015}+2016}>\frac{18144}{10^{2016}+2016}\)
\(\Rightarrow10A>10B\Leftrightarrow A>B\)
So sánh A và B
A=2014/2015+2015/2016
B=(2014+2015)/(2015+2016)
so sánh: \(A=\frac{2014}{2015}+\frac{2015}{2016}\) và \(B=\frac{2014+2015}{2015+2016}\)
\(\Rightarrow B=\frac{2014}{2015+2016}+\frac{2015}{2015+2016}\)
Ta có: \(\frac{2014}{2015}>\frac{2014}{2015+2016}\) vì \(2015<2015+2016\)
\(\frac{2015}{2016}>\frac{2015}{2015+2016}\) vì \(2016<2015+2016\)
\(\Rightarrow\frac{2014}{2015}+\frac{2015}{2016}>\frac{2014}{2015+2016}+\frac{2015}{2015+2016}\)
\(\Rightarrow\frac{2014}{2015}+\frac{2015}{2016}>\frac{2014+2015}{2015+2016}\)
Vậy: \(A>B\)
So sánh biểu thức A Và B biết: a=1/1008+1/2013-1/2016*2017 b= 1/2014+1/2016+1/2017+1/2014*2016
A = 1/1008 + 1/2013 - 1/2006*2007 -> A cho giá trị là số âm (lớp 5 hs không học số âm) -> đề sai
So sánh A và B biết:
A=10^2014+2016/10^2015+2016
B=10^2015+2016/10^2016+2016
so sánh A=2013/2014 + 2014/2015 + 2015/2016 và B=2013+2014+2015/2014+2015+2016
A = \(\frac{2013}{2014}+\frac{2014}{2015}>\frac{1}{2}+\frac{1}{2}=1\)
\(B=\frac{2013+2014+2015}{2014+2015+2016}<1\)
\(Vậy:A>B\)
Đúng nha Nguyễn Bình Minh
so sánh:
\(A=\frac{2013}{2014}+\frac{2014}{2015}+\frac{2015}{2016}\) và\(B=\) \(\frac{2013+2014+2015}{2014+2015+2016}\)
\(B=\frac{2013}{2014+2015+2016}+\frac{2014}{2014+2015+2016}+\frac{2015}{2014+2015+2016}\)
Ta có: \(\frac{2013}{2014}>\frac{2013}{2014+2015+2016}\)
\(\frac{2014}{2015}>\frac{2014}{2014+2015+2016}\)
\(\frac{2015}{2016}>\frac{2015}{2014+2015+2016}\)
\(\Rightarrow\frac{2013}{2014}+\frac{2014}{2015}+\frac{2015}{2016}>\frac{2013+2014+2015}{2014+2015+2016}\)
Vậy: \(A>B\)
So sánh A = \(\dfrac{10^{2014}+2016}{10^{2015}+2016}\) và B = \(\dfrac{10^{2015}+2016}{10^{2016}+2016}\) giúp mình nhanh với
\(10A=\dfrac{10^{2015}+2016+9\cdot2016}{10^{2015}+2016}=1+\dfrac{18144}{10^{2015}+2016}\)
\(10B=\dfrac{10^{2016}+9+18144}{10^{2016}+2016}=1+\dfrac{18144}{10^{2016}+2016}\)
mà \(\dfrac{18144}{10^{2015}+2016}>\dfrac{18144}{10^{2016}+2016}\)
nên A>B
so sánh A và B,biết:
A=10^2014+2016/10^2015+2016
B=10^2015+2016/10^2016+2016
gải đầy đủ cho 2 tick
So sánh:
a) A=9^10 và B= ( 8^9+7^9+6^9+...+2^9+1^9)
b) P= 2013/2014 + 2014/2015 + 2015/2016 với Q= 2013+2014+2015 / 2014+2015+2016