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

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

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

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

a) ta có \(\frac{1234}{1235}=1-\frac{1}{1235}\)

\(\frac{4319}{4320}=1-\frac{1}{4320}\)

vì \(\frac{1}{1235}>\frac{1}{4320}\Rightarrow1-\frac{1}{1235}< 1-\frac{1}{4320}\)

\(\Rightarrow\frac{1234}{1235}< \frac{4319}{4320}\)

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

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

vì \(\frac{10}{1244}>\frac{10}{4331}\Rightarrow1-\frac{10}{1244}< 1-\frac{10}{4331}\)

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

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

A)

1- 1234/1235= 1/1235

1- 4319/4320= 1/4320

Vậy 1/1235 > 1/4320

1234/1235 > 4329/4320

Đ/s:...

Ko chắc, sai bỏ qa

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+4321=5555

Bài giải

Số cần tìm là :

1234 + 4321 = 5555

Đáp số : .....

Phân số thứ 2 lớn hơn

`@` `\text {Ans}`

`\downarrow`

\(\dfrac{253}{-254}=\dfrac{-253}{254}\)

\(-\dfrac{1234}{1232}=\dfrac{-617}{616}\)

Ta có: \(\dfrac{617}{616}>1\) ; \(\dfrac{253}{254}< 1\)

`=>`\(\dfrac{617}{616}>\dfrac{253}{254}\)

`=>`\(\dfrac{-617}{616}< \dfrac{-253}{254}\)

Vậy, \(\dfrac{253}{-254}>\dfrac{-1234}{1232}\).

\(MSC=254.1232\)

\(\dfrac{253}{-254}=\dfrac{-253}{254}=\dfrac{-253.1232}{254.1232}=\dfrac{\text{-311696}}{254.1232}\)

\(\dfrac{-1234}{1232}=\dfrac{-1234.254}{254.1232}=\dfrac{\text{-313436}}{254.1232}\)

mà \(\dfrac{\text{-313436}}{254.1232}< \dfrac{\text{-311696}}{254.1232}\)

\(\Rightarrow\dfrac{-1234}{1232}< \dfrac{253}{-254}\)

\(\)

b] \(\frac{127}{-128}>-1\)\(;\)\(\frac{-1345}{1244}< -1\)

\(\Rightarrow\frac{127}{-128}>-1>\frac{-1345}{1244}\Rightarrow\frac{127}{-128}>\frac{-1345}{1244}\)

c]\(\frac{-11}{33}=\frac{-1}{3}\)\(;\)\(\frac{25}{-76}>\frac{25}{-75}=\frac{-1}{3}\)\(\Rightarrow\frac{-11}{33}=\frac{-1}{3}< \frac{25}{-76}\Rightarrow\frac{-11}{33}< \frac{25}{-76}\)

d] \(\frac{-171717}{232323}=\frac{-17\times10101}{23\times10101}=\frac{-17}{23}\)\(\Rightarrow\frac{-17}{23}=\frac{-171717}{232323}\)