12/37<13/38

\(\frac{12}{37}=0,3243...,\frac{13}{38}=0,3421...\)

=> \(\frac{12}{37}<\frac{13}{38}\)

12/37<13/38

Ta có: 13/38 > 13/39 = 1/3

=> 13/38 > 1/3.

13/38<1/3 

Anh em cho 1 L_I_K_E cứ quy đồng khác ra @_^

\(\frac{13}{38}>\frac{13}{39}=\frac{1}{3}\)

\(\Rightarrow\frac{13}{38}>\frac{1}{3}\)

a) \(\dfrac{7}{12}< \dfrac{7+1}{12+1}< \dfrac{78}{13}\Rightarrow\dfrac{7}{12}< \dfrac{8}{13}\)

b) \(-4,25=-\dfrac{425}{100}=-\dfrac{17}{4}=-\dfrac{34}{8}< -\dfrac{28}{8}\Rightarrow-4,25< -\dfrac{28}{8}\)

c) \(-0,33>-0,5=-\dfrac{1}{2}=-\dfrac{19}{38}\Rightarrow-0,33>-\dfrac{19}{38}\)

d) \(\dfrac{11}{13}< \dfrac{11+2}{13+2}=\dfrac{13}{15}\Rightarrow\dfrac{11}{13}< \dfrac{13}{15}\Rightarrow-\dfrac{11}{13}>-\dfrac{13}{15}\)

a) -1/5 = -0,2 

b) -2/3 < 4/9 

c) -13/38 > 2/-88

phần c là -13/38 > 29/-88

So sánh nhanh nha m.n

\(-\frac{23}{38}>-\frac{13}{38}\)

-23/88>-13/38

kick minh nha

minh dang it diem

\(\frac{-23}{88}>\frac{-13}{38}\)

Xét \(\frac{13}{38}>\frac{13}{39}=\frac{1}{3}=\frac{29}{87}>\frac{29}{88}\)

\(\Rightarrow\frac{13}{38}>\frac{29}{88}\)

\(\Rightarrow\frac{-13}{38}< \frac{29}{-88}\)

Vậy \(\frac{-13}{38}< \frac{29}{-88}\)

Dùng phương pháp tính phần bù:

Ta có:

\(1-\frac{13}{38}=\frac{25}{38}\)

\(1-\frac{12}{37}=\frac{25}{37}\)

\(\frac{25}{38}< \frac{25}{37}\Rightarrow\frac{13}{38}>\frac{12}{37}\)

38/13<3<43/14 k nha bạn 

\(\frac{38}{13}< 3;\frac{43}{14}>3\)

Nên \(\frac{38}{13}< \frac{43}{14}\)

\(\frac{38}{13}\)< \(\frac{43}{14}\)