Hãy so sánh:\(A=\frac{17^{201}+1}{17^{202}+1}vàB=\frac{17^{200}+1}{17^{201}+1}\)
1/so sánh
a. A=17201+1/17202+1 và B=17200+1/17201+1
b.S=1/31+1/32+1/33+...+1/60 và 4/5
c.C=54.107-53/53.107+54 và D=135.259-133/134.269+135 ( không thực hiện phép tính ở mẫu )
so sánh
\(A=\frac{17^{18}+1}{17^{19}+1}vàB\frac{17^{11}+1}{17^{18}+1}\)
giúp mih huhu
\(A=\frac{17^{18}+1}{17^{19}+1}<\frac{17^{18}+1+16}{17^{19}+1+16}=\frac{17^{18}+17}{17^{19}+17}=\frac{17\left(17^{17}+1\right)}{17\left(17^{18}+1\right)}=\frac{17^{17}+1}{17^{18}+1}\)
\(\Rightarrow\frac{17^{18}+1}{17^{19}+1}<\frac{17^{17}+1}{17^{18}+1}\) => A < B
Không tính , hãy so sánh :
\(A=\frac{199}{200}+\frac{200}{201}+\frac{201}{202}\)
\(B=\frac{199+200+201}{200+201+202}\)
\(\frac{199}{200}>\frac{199}{200+201+202}\)
\(\frac{200}{201}>\frac{200}{200+201+202}\)
\(\frac{201}{202}>\frac{201}{200+201+202}\)
=>\(A>B\)
Do \(\frac{199}{200}\)> \(\frac{199}{200+201+202}\), \(\frac{200}{201}\)>\(\frac{200}{200+201+202}\),\(\frac{201}{202}\)>\(\frac{201}{200+201+202}\)nên A>B
Không tính , hãy so sánh :
\(A=\) \(\frac{199}{200}+\frac{200}{201}+\frac{201}{202}\)
\(B=\frac{199+200+201}{200+201+202}\)
\(A=\frac{199}{200}+\frac{200}{201}+\frac{201}{202}< \frac{199}{200+201+202}+\frac{200}{200+201+202}+\frac{201}{200+201+202}\)
A \(< \frac{199+200+201}{200+201+202}=B\)
\(A< B\)
Ta có: \(A=\frac{199}{200}+\frac{200}{201}+\frac{201}{202}< \frac{199}{200+201+202}+\frac{200}{200+201+202}+\frac{201}{200+201+202}< \)
\(< \frac{199+200+201}{200+201+202}\)
Vậy A < B
ỦNG HỘ TỚ NHA
\(B=\frac{199+200+201}{200+201+202}\)
\(B=\frac{199}{200+201+202}+\frac{200}{200+201+202}+\frac{201}{200+201+202}< \frac{199}{200}+\frac{200}{201}+\frac{201}{202}=A\)
Vậy B < A ( bài này chủ yếu so sánh hai phân số cùng từ, phân số nào có mẫu lớn hơn thì phân số đó nhỏ hơn )
ko quy đồng hãy so sánh \(A=\frac{-5}{10^{2009}}+\frac{-17}{10^{2010}}vàB=\frac{-17}{10^{2009}}+\frac{-5}{10^{2010}}\)
cu lay phep tinh nay tru phep tinh kia hk ra thi nt hoi mink
so sánh 2 phân số \(\frac{200}{201}+\frac{201}{202}và\frac{200+201}{201+202}\)
Ta có:\(\frac{200}{201}>\frac{200}{201+202}và\frac{201}{202}>\frac{201}{201+202}\)
Suy ra\(\frac{200}{201}+\frac{201}{202}>\frac{200}{201+202}+\frac{201}{201+202}=\frac{200+201}{201+202}\)
Vậy\(\frac{200}{201}+\frac{201}{202}>\frac{200+201}{201+202}\)
Ta co:\(\frac{200+201}{201+202}=\frac{200}{201+202}+\frac{201}{201+202}\)
Vi \(\frac{200}{201}>\frac{200}{201+202},\frac{201}{202}>\frac{201}{201+202}\Rightarrow\frac{200}{201}+\frac{201}{202}>\frac{200+201}{201+202}\)
Ta có : \(\frac{200+201}{201+202}=\frac{200}{201+202}+\frac{201}{201+201}\)
Mà : \(201<201+202\Rightarrow\frac{200}{201}>\frac{200}{201+202}\)
\(\frac{201}{202}>\frac{201}{201+202}\)
\(\Rightarrow\frac{200}{201}+\frac{201}{202}>\frac{200+201}{201+202}\)
\(hnhaminhhlai\)
so sánh:
\(\frac{2009}{2010}và\frac{2010}{2011}\)\(\frac{1}{3^{400}}và\frac{1}{4^{300}}\)
\(\frac{200}{201}+\frac{201}{202}và\frac{200+201}{201+202}\)\(\frac{2008}{2008.2009}và\frac{2009}{2009.2010}\)
2009/2010=1-1/2010<1-1/2011=2010/2011
vậy 2009/2010<2010/2011
3^400=(3^4)^100=81^100>64^100=4^300
=>1/3^400<1/4^300
Vậy 1/3^400<1/4^300
So sánh A và B biết:\(A=\frac{10^{15}+1}{10^{16}+1}vàB=\frac{10^{16}+1}{10^{17}+1}\)
1)So sánh các số
a.200/201+201/202 và 200+201/201+202
b)2014/2014*2015=2014:2014/2014*2015:2014=1/2015(rút gọn phân số)
2015/2015*2015=2015:2015/2015*2016:2015=1/2016(rút gọn phân số)
Mà 1/2015>1/2016
=>2014/2014*2015>2015/2015*2015