Cho A=\(\frac{10^{2015}+1}{10^{2014}+1}\) ; B=\(\frac{10^{2016}+1}{10^{2015}+1}\)
Hãy so sánh A và B.
cho A=\(\frac{10^{2015}-1}{10^{2016}-1}\)và B=\(\frac{10^{2014}+1}{10^{2015}+1}\). So sánh A và B
\(A=\frac{10^{2015}-1}{10^{2016}^{ }-1}=\frac{10^{2015}}{10^{2016}}=\frac{1}{1},B=\frac{10^{2014}-1}{10^{2015}-1}=\frac{10^{2014}}{10^{2015}}=\frac{1}{1}A=B\Rightarrow\)
So sánh:\(A=\frac{10^{2015}-1}{10^{2016}-1}vàB=\frac{10^{2014}+1}{10^{2015}+1}\)
so sánh A=\(\frac{10^{2015-1}}{10^{2016-1}}\)và B=\(\frac{10^{2014+1}}{10^{2015+1}}\)
so sanh A=\(\frac{10^{2015}-1}{10^{2016}-1}\) B=\(\frac{10^{2014}+1}{10^{2015}+1}\)
AI GIẢI BÀI NÀY XONG TRƯỚC MÀ RÕ RÀNG NHẤT THÌ MK TICK CHO:
Cho 2 phân số: \(A=\frac{10^{2013}+1}{10^{2014}+1};B=\frac{10^{2014}+1}{10^{2015}+1}\)
HÃY SO SÁNH A VÀ B
Ta có công thức :
\(\frac{a}{b}< \frac{a+c}{b+c}\)\(\left(\frac{a}{b}< 1;a,b,c\inℕ^∗\right)\)
Áp dụng vào ta có :
\(B=\frac{10^{2014}+1}{10^{2015}+1}< \frac{10^{2014}+1+9}{10^{2015}+1+9}=\frac{10^{2014}+10}{10^{2015}+10}=\frac{10\left(10^{2013}+1\right)}{10\left(10^{2014}+1\right)}=\frac{10^{2013}+1}{10^{2014}+1}=A\)
\(\Rightarrow\)\(B< A\) hay \(A>B\)
Vậy \(A>B\)
Chúc bạn học tốt ~
áp dụng tính chất
nếu a/b>1thì a/b<(a+n)/(b+n)
=)))))))))))))))))
So Sánh
A=\(\frac{10^{2013}+1}{10^{2014}+1}\)
B=\(\frac{10^{2014}+1}{10^{2015}+1}\)
Vì \(\frac{10^{2014}+1}{10^{2015}+1}< 1\Rightarrow B=\frac{10^{2014}+1}{10^{2015}+1}< \frac{10^{2014}+1+9}{10^{2015}+1+9}\)
\(\Rightarrow B< \frac{10^{2014}+10}{10^{2015}+10}\)
\(\Rightarrow B< \frac{10\left(10^{2013}+1\right)}{10\left(10^{2014}+1\right)}\)
\(\Rightarrow B< \frac{10^{2013}+1}{10^{2014}+1}\)
\(\Rightarrow B< A\)
Vậy A > B
SO SÁNH A =\(\frac{10^{2014}+1}{10^{2015}+1}\) VÀ B = \(\frac{10^{2015}+1}{10^{2016}+1}\)
So sánh A = \(\frac{10^{2014}+1}{10^{2015}+1}\) và B = \(\frac{10^{2015}+1}{10^{2016}+1}\)
10A=(10^2014+1).10/10^2015+1=10^2015+10/10^2015+1=10^2015+1+9/10^2015+1=1+(9/10^2015+1) 10B=(10^2015+1).10/10^2016+1=10^2016+10/10^2016+1=10^2016+1+9/10^2016+1=1+(9/10^2016+1) Vì 9/10^2015+1>9/10^2016+1 nên 10A>10B .Từ đó suy ra A>B
So sánh
A = \(\frac{10^{2014}+1}{10^{2013}+1}\)và B = \(\frac{10^{2015}+1}{10^{2014}+1}\)
Giúp mk với!!!
{\_/}
(~.~)
có :
\(B=\frac{10^{2015}+1}{10^{2014}+1}>1\)
\(\Rightarrow\frac{10^{2015}+1}{10^{2014}+1}>\frac{10^{2015}+1+9}{10^{2014}+1+9}\) \(=\frac{10^{2015}+10}{10^{2014}+10}=\frac{10.\left(10^{2014}+1\right)}{10.\left(10^{2013}+1\right)}\)
\(=\frac{10^{2014}+1}{10^{2013}+1}=A\)
\(\Rightarrow B>A\)
Vậy B > A
k cho mk nhé