Ta có: \(1-\frac{25}{26}\)\(=\frac{1}{26}\)

Lại có: \(1-\frac{25251}{26261}\)\(=\frac{1010}{26261}\)

Vậy ta so sánh: \(\frac{1}{26}\)với \(\frac{1010}{26261}\)

Quy đồng \(\frac{1}{26}\)ta có: \(\frac{1}{26}=\frac{1010}{26260}\)

Do 26260 < 26261 \(\Rightarrow\)\(\frac{1010}{26260}>\frac{1010}{26261}\)\(\Rightarrow\)\(\frac{1}{26}>\frac{1010}{26261}\)

\(\Rightarrow\frac{25}{26}< \frac{25251}{26261}\)

Duyệt đi, chúc bạn học giỏi!

vì 25/26=25250/26260 nên 25251/26261>25250/26260 vậy 25251/26261>25/26 hoặc cậu lấy máy tính bấm 25251/26261 - 25/26 còn dư nghĩa là 25251/26261>25/26 hoặc ngược lại

1 - 25/26 = 1/26 = 1010/26260

1 -  25251/26261 = 1010/26261

vì 1010/26260 > 1010/26261 nên 25/26 > 25251/26261

sorry chỉ làm đuoc 25/26 bé hon 25251/26261 

85 / 84 lớn hơn 23/53

85/84 lớn hơn 35/36

a) <

b)<

c)<

\(\frac{85}{73}>\frac{81}{76}\)

85/73 > 81/76

ôi trời câu thậy là dễ

Ta có:

\(\frac{25}{26}=\frac{2525}{2626}=\frac{25250}{26260}\)

Vì \(\frac{25250}{26260}< \frac{25251}{26261}\)

\(\Rightarrow\frac{25}{26}< \frac{25251}{26261}\)

\(\left\{\begin{matrix}A=\frac{25}{26}\\B=\frac{25251}{26261}\end{matrix}\right.\)

\(\frac{25}{26}=\frac{25.1010}{26.1010}=\frac{25250}{26260}\)

\(A-B=\frac{25250}{25250}-\frac{25251}{26261}=\frac{25250.26261-25251.26260}{25250.26261}=\frac{\left(25251-1\right)\left(26260+1\right)-25251.2620}{25250.26261}\)

\(A-B=\frac{25251.26260-2-25251.2620}{25250.26261}=-\frac{2}{25250.26261}< 0\)

\(A-B< 0\Rightarrow A< B\)

Cần nhớ:

\(\frac{a}{b}< 1\Rightarrow\frac{a}{b}< \frac{a+n}{b+n}\left(n\inℕ^∗\right)\)

\(\frac{a}{b}>1\Rightarrow\frac{a}{b}>\frac{a+n}{b+n}\left(n\inℕ^∗\right)\)

Ta thấy:

\(\frac{19}{29}< 1\Rightarrow\frac{19}{29}< \frac{19+1}{29+1}=\frac{20}{30}=\frac{2}{3}\)

Ta lại có:

\(\frac{2}{3}=\frac{2.7}{3.7}=\frac{14}{21}< 1\Rightarrow\frac{14}{21}< \frac{14+6}{21+6}=\frac{20}{27}=\frac{20.3}{27.3}=\frac{60}{81}\)

\(\Rightarrow\frac{19}{29}< \frac{60}{81}\)     (1)

Ta có:

\(\frac{60}{81}=\frac{20}{27}< 1\Rightarrow\frac{20}{27}< \frac{20+1}{27+1}=\frac{21}{28}< \frac{21}{25}\)

=>\(\frac{60}{81}< \frac{21}{25}\)     (2)

Từ (1) và (2) => \(\frac{19}{29}< \frac{60}{81}< \frac{21}{25}\)

\(\frac{21}{25}=\frac{49329}{58725}\)

\(\frac{60}{81}=\frac{43500}{58725}\)

\(\frac{19}{29}=\frac{38475}{58725}\)

\(\)vì \(\frac{49329}{58725}>\frac{43500}{58725}>\frac{38475}{58725}\)nên\(\frac{21}{25}>\frac{60}{81}>\frac{19}{29}\)

\(\frac{21}{25};\frac{60}{81};\frac{19}{29}\)

Ta có : \(\frac{60}{81}=\frac{60:3}{81:3}=\frac{20}{27}\); giữ nguyên \(\frac{21}{25};\frac{19}{29}\).

Vì \(\frac{21}{25}>\frac{20}{25}>\frac{20}{27}\)nên \(\frac{21}{25}>\frac{20}{27}\)

Vì  \(\frac{20}{27}>\frac{20}{29}>\frac{19}{29}\)nên \(\frac{20}{27}>\frac{19}{29}\). Vậy :

\(\frac{21}{25}>\frac{20}{27}>\frac{19}{29}\)hay  \(\frac{21}{25}>\frac{60}{81}>\frac{19}{29}\)

Quy đồng 2 phân số về dạng mẫu số chung . Ta có :

\(\frac{-64}{85}=\frac{-64.81}{85.81}=\frac{-5184}{6885}\)

\(\frac{-73}{81}=\frac{-73.85}{81.85}=\frac{-6205}{6885}\)

Ta thấy : (-5184) > (-6205) \(\left(\frac{-5184}{6885}>\frac{-6205}{6885}\right)\)

Vậy \(\frac{-64}{85}>\frac{-73}{81}\)

\(\frac{64}{85}\)< \(\frac{73}{81}\)

yêu bạn nhiều

làm chi tiết cho mình di

ta có\(\frac{64}{85}< \frac{64}{81}< \frac{73}{81}\Rightarrow\frac{64}{85}< \frac{73}{81}\)