a, -1/4<0

1/100>0

=> -1/4<1/100

b) -11/32=-11.25/ 32.25=-275/800

-25/ 76=-25.11/ 76.11=-275/ 836

=>275/800>275/836

=> -275/800< -275/836

c) -127/128> -1

-1345/1344< -1

=> 127/ -128> -1345/ 1344

d) -171717/ 232323= -17.10101/ 23.10101=-17/23

e) -1/25<0

1/1225>0

=> -1/25< 1/1225

f) 215/216<1

104/103>1

=> 215/216< 104/103

g) -12/19= 19-31/ 19= 1-31/19

-14/17= 17-31/ 17= 1-31/17

mà 31/19< 31/17

=> 1-31/19> 1-31/17

=>-12/19> -14/17

Giair giúp mình đi!!! Cần gấp!!!!

a)      Ta có \(\frac{{ - 2}}{3} < 0\) và \(\frac{1}{{200}} > 0\) nên \(\frac{{ - 2}}{3}\)<\(\frac{1}{{200}}\).

b)      Ta có: \(\frac{{139}}{{138}} > 1\) và \(\frac{{1375}}{{1376}} < 1\) nên \(\frac{{139}}{{138}}\) > \(\frac{{1375}}{{1376}}\).

c)      Ta có: \(\frac{{ - 11}}{{33}} = \frac{{ - 1}}{3}\) và \(\frac{{25}}{{ - 76}} = \frac{{ - 25}}{{76}} > \frac{{ - 25}}{{75}} = \frac{{ - 1}}{3}\,\,\,\, \Rightarrow \frac{{25}}{{ - 76}} > \frac{{ - 11}}{33}\).

a: -2/3<0<1/200

b: 139/138>1

1375/1376<1

=>139/138>1375/1376

c: -11/33=-1/3=-25/75<-25/76

a: \(-\dfrac{11}{33}< 0< \dfrac{25}{16}\)

b: \(-\dfrac{17}{23}=\dfrac{-171717}{232323}\)

\(\dfrac{11}{33}=\dfrac{11}{3.11}=\dfrac{1}{3}\)

\(\dfrac{25}{76}< \dfrac{25}{75}=\dfrac{1}{3}\)

\(\Rightarrow\dfrac{11}{33}>\dfrac{25}{76}\)

\(\Rightarrow-\dfrac{11}{33}< -\dfrac{25}{76}\)

\(\Rightarrow\dfrac{-11}{33}< \dfrac{25}{-76}\)

Vì 5 < 1000

Nên 1/5>1/1000

Vậy 1/5>1/1000

\(\frac{-11}{33}=-\frac{1}{3}\)

\(\frac{25}{-76}>-\frac{25}{75}=-\frac{1}{3}\)

\(\Rightarrow\frac{-11}{33}< \frac{25}{-76}\)

TA có : 

\(x_1=\frac{19019}{76076}=\frac{1}{4}\)

\(x_2=\frac{-1919}{-7676}=\frac{1}{4}\)

\(x_3=\frac{-19}{-76}=\frac{1}{4}\)

\(\Rightarrow x_1=x_2=x_3\)

Tập hợp các số hữu tỉ  \(A=\left\{\frac{1}{4}\right\}\)