\(1-\frac{51}{56}=\frac{5}{56}\) ; \(1-\frac{61}{66}=\frac{5}{66}\)

Vì \(\frac{5}{56}>\frac{5}{66}\) nên \(\frac{51}{56}

\(\frac{58}{89}=\frac{58.18}{89.18}=\frac{1044}{1602}\)

\(\frac{36}{53}=\frac{36.29}{53.29}=\frac{1044}{1537}\)

Nhận thấy: 1602 > 1537 => \(\frac{1044}{1602}< \frac{1044}{1537}\)

=> \(\frac{58}{89}< \frac{36}{53}\)

ko quy đồng mà

\(\frac{22}{27}+\frac{37}{67}=\left(1-\frac{5}{27}\right)+\left(1-\frac{30}{67}\right)\)

\(\frac{31}{36}+\frac{377}{677}=\left(1-\frac{5}{36}\right)+\left(1-\frac{300}{677}\right)\)

+ \(\frac{5}{27}>\frac{5}{36}\Rightarrow1-\frac{5}{27}< 1-\frac{5}{36}\left(1\right)\)

+ \(\frac{30}{67}=\frac{300}{670}>\frac{300}{677}\Rightarrow1-\frac{30}{67}< 1-\frac{300}{677}\) (2)

Từ (1) và (2) \(\Rightarrow\frac{22}{27}+\frac{37}{67}< \frac{31}{36}+\frac{377}{677}\)

Vsu

a) ta có:  \(1-\frac{2012}{2013}=\frac{1}{2013}\)

                 \(1-\frac{2013}{2014}=\frac{1}{2014}\)

mà \(\frac{1}{2013}>\frac{1}{2014}\) nên   \(\frac{2013}{2014}>\frac{2012}{2013}\)

sao giống lớp 4 thế ta

a) \(\frac{40}{57}< \frac{41}{57}< \frac{41}{55}\)

b) \(\frac{41}{11}>\frac{33}{11}=3=\frac{30}{10}>\frac{23}{11}\)

c) \(\frac{2}{15}>\frac{2}{21}\Rightarrow3+\frac{2}{15}>3+\frac{2}{21}\Rightarrow\frac{47}{15}>\frac{65}{21}\)

Có : vì -22/103> -51/103

Suy ra : -22/44 > -51/103

-22/44 > -51/103

-5/8=-35/56

-6/7=-48/56

mà -35>-48

nên -5/8>-6/7

\(\dfrac{-5}{8}và\dfrac{6}{-7}=\dfrac{-5}{8}và\dfrac{-6}{7}=\dfrac{-35}{56}và\dfrac{-48}{56}=>\dfrac{-35}{56}>\dfrac{-48}{56}hay\dfrac{-5}{8}>\dfrac{6}{-7}\)