a) \(\frac{1}{1235}>\frac{1}{4320}\Rightarrow-\frac{1}{1235}< -\frac{1}{4320}\Rightarrow1-\frac{1}{1235}< 1-\frac{1}{4320}\Rightarrow\frac{1234}{1235}< \frac{4319}{4320}.\)

b) \(\frac{10}{1244}< \frac{10}{4331}\Rightarrow\frac{10}{1244}-1< \frac{10}{4331}-1\Rightarrow-\frac{1234}{1244}< -\frac{4321}{4331}\)

a)  Ta có:

1234/1235 = 1 - 1/1235

4319/4320 = 1 - 1/4320

Vì 1/1235 > 1/4320

=> 1234/1235 < 4319/4320

b) -1234/1244 = -1 + 10/1244

-4321/4331 = -1 + 10/4331

Vì 10/1244 > 10/4331

=> -1 + 10/4331 > -1/4331

Ủng hộ mk nha ♡_♡

mình mới học lớp 4 nên ko bít

em ko biết,xin lỗi chị nhiều lắm

1234 phần 1235 bằng 4319 phần 4320

\(\frac{-1234}{1244}=\frac{10}{1234}-\frac{1244}{1244}=\frac{10}{1234}-1\)

\(\frac{-4321}{4331}=\frac{10}{4331}-\frac{4331}{4331}=\frac{10}{4331}-1\)

Vì 1234<4331 nên \(\frac{10}{1234}>\frac{10}{4331}\)

=>\(\frac{10}{1234}-1

\(\frac{-1234}{1244}\)và  \(\frac{-4321}{4331}\)

Ta có: 

\(\frac{-1234}{1244}=\frac{-1234\times4331}{1244\times4331}=\frac{-5344454}{5387764}\)

  \(\frac{-4321}{4331}=\frac{-4321\times1244}{1244\times4331}=\frac{-5375324}{5387764}\)

Ta thấy: \(\frac{-5344454}{5387764}>\frac{-5375324}{5387764}\)

\(\Rightarrow\frac{-1234}{1244}>\frac{-4321}{4331}\)

So sánh

−1234/1244    >       −4321/4331 

bằng nhau

Ta có:

\(\dfrac{-1234}{1244}=-1+\dfrac{10}{1244}\)

\(\dfrac{-4321}{4331}=-1+\dfrac{10}{4331}\)

Vì \(\dfrac{10}{1244}>\dfrac{10}{4331}\)

\(\Rightarrow-1+\dfrac{10}{1244}>-1+\dfrac{10}{4331}\)

hay \(\dfrac{-1234}{1244}>\dfrac{-4321}{4331}\)

\(\dfrac{1234}{1244}< \dfrac{1234+3037}{1244+3037}=\dfrac{4331}{4321}\)

\(\Rightarrow\dfrac{1234}{1244}< \dfrac{4331}{4321}\)

\(\Rightarrow-\dfrac{1234}{1244}>-\dfrac{4331}{4321}\)

\(\Rightarrow\dfrac{-1234}{1244}>\dfrac{4331}{-4321}\)

Thành ko chép mạng nhé

31/32= 1 -1/32

31317/32327= 1- 1010/32327 

ta có 1010/32327 x 32 = 32320/32327 <1=32/32=1/32 x 32

=> 1010/32327<1/32 => 31317/32327 > 31/32 

Ta có\(\frac{-31}{-32}=\frac{31}{32}=\frac{31310}{32320}\)

Vì 31310<32320 nên \(\frac{31310}{32320}< 1\)

\(\Rightarrow\frac{31310}{32320}< \frac{31310+7}{32320+7}=\frac{31317}{32327}\)

\(\frac{-31}{-32}< \frac{31317}{32327}\)

Học tốt

-18/91 = -0,19...

-23/114 = -0,20...

mà 0,20...> 0,19... nên -0,19... > -0,20...

vậy -18/91 > -23/114

không biết

b) Ta có:

\(\frac{1234.1235-1}{1234.1235}=1-\frac{1}{1234.1235}\)

\(\frac{1235.1236-1}{1235.1236}=1-\frac{1}{1235.1236}\)

DO \(\frac{1}{1234.1235}>\frac{1}{1235.1236}\)=> \(-\frac{1}{1234.1235}< -\frac{1}{1235.1236}\)

=> \(\frac{1234.1235-1}{1234.1235}< \frac{1235.1236-1}{1235.1236}\)