1986/2647 lớn hơn 1575/2101 , nha

\(\frac{1986}{2647}< \frac{1575}{2101}\)\(\frac{1986}{2647}và\frac{1575}{2101}\) 

247/871<274/817

1986/2647>1575/2101 

Duyệt mình nha!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ta có phân số trung gian \(\frac{-22}{45}\)và \(\frac{-54}{103}\)là : \(\frac{-22}{103}\)

\(\Rightarrow\frac{-22}{103}< \frac{-22}{45};\frac{-22}{103}>\frac{-51}{103}\)

\(\Rightarrow\frac{-22}{45}>\frac{-51}{103}\)

Thì bạn quy đồng ra như thế này nè:  -22/45 = -2266/4635; -51/103 = -2295/4635 rồi so sánh

trả lời sai rồi bạn Lê Mạnh Tiến Đạt 

-22/103 > -22/45 mà 

TK: 

https://hoc24.vn/cau-hoi/so-sanh-va-giai-thich-li-do-tai-saoa-13-15-va-133-153b-13-15-va-1333-1555.56284556821

\(A=3\left(\frac{3}{1\cdot4}+\frac{3}{4\cdot7}+\frac{3}{7\cdot10}+.....+\frac{3}{55\cdot58}\right)\)

\(A=3\left(\frac{1}{1}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+.....+\frac{1}{55}-\frac{1}{58}\right)\)

\(A=3\left(1-\frac{1}{58}\right)\)

\(A=3-\frac{1}{174}< 3< \frac{10}{3}\)

ta có \(\frac{2000+2002}{2001+2003}\)= \(\frac{2000}{2001+2003}\)+ \(\frac{2002}{2001+2003}\)=\(\frac{2000}{4004}\)+\(\frac{2002}{4004}\)

ta có \(\frac{2000}{2001}\)>\(\frac{2000}{4004}\) và \(\frac{2002}{2003}\)> \(\frac{2002}{4004}\)

 nên \(\frac{2000}{2001}\)+\(\frac{2002}{2003}\)>\(\frac{2000}{4004}\)+\(\frac{2002}{4004}\)

vậy \(\frac{2000}{2001}\)+\(\frac{2002}{2003}\)>\(\frac{2000+2002}{2001+2003}\)

\(\frac{2000+2002}{2001+2003}=\frac{2000}{2001+2003}+\frac{2002}{2001+2003}< \frac{2000}{2001}+\frac{2002}{2003}\)

 vi 53/53.107 =1/107 nenA > 54.107+54 < 135.269 < B

đề dài vậy

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