giúp mik vs mik cần gấp 

VIẾT HẲN PS RA CHỨ KO HIỂU

a: Sai

b: Đúng

c: Sai

\(\frac{5}{14}=\frac{5.20}{14.20}=\frac{100}{280}\)

\(\frac{3}{-40}=\frac{3.\left(-7\right)}{\left(-40\right).\left(-7\right)}=\frac{-21}{280}\)

\(\frac{-13}{-140}=\frac{13}{140}=\frac{13.2}{140.2}=\frac{26}{280}\)

\(\frac{-90}{60}\) ; \(\frac{220}{60}\) ; \(\frac{84}{60}\)

A) \(\frac{17}{320}\)VÀ \(\frac{-9}{80}\)

\(\frac{17}{320}\)

\(\frac{-9}{80}=\frac{-36}{320}\)

B) \(\frac{-7}{10}\)VÀ \(\frac{1}{33}\)

\(\frac{-7}{10}=\frac{-231}{330}\)

\(\frac{1}{33}=\frac{10}{330}\)

C) \(\frac{-5}{14};\frac{3}{20}\)VÀ \(\frac{9}{70}\)

\(\frac{-5}{14}=\frac{-50}{140}\)

\(\frac{3}{20}=\frac{21}{140}\)

\(\frac{9}{70}=\frac{18}{140}\)

D) \(\frac{10}{42}=\frac{5}{21};\frac{-3}{28}\)VÀ \(\frac{-55}{132}\)

\(\frac{5}{21}=\frac{220}{924}\)

\(\frac{-3}{28}=\frac{-99}{924}\)

\(\frac{-55}{132}=\frac{-385}{924}\)

CHÚC BN HỌC TỐT!!!!!

MSC:60 NHA BẠN 

ko bé ơi 

a: -9/20=-36/320

17/320=17/320

b: -7/10=-231/330

1/33=10/330

c: -5/15=-1/3=-140/420

3/20=63/420

9/70=54/420

d: 10/42=5/21=20/84

-3/28=-9/84

-55/132=-5/12=-35/84

1:-5/14=-50/140

3/20=21/140

9/70=18/140

2: -55/132=-5/12=-35/84

10/42=20/84

-3/28=-9/84

3: 7/10=231/330

1/33=10/330

MSC : 360

`5/8 = (5xx45)/(8xx45)=225/360`

`7/20=(7xx18)/(20xx18)=126/360`

`-4/9=(-4xx40)/(9xx40)=-160/360`

=50/180;63/180;-80/180