Theo thứ tự : 5/6 ; 2/3 ; 2/3 ; 3/2 ; 2/3 ; 3/8 ; 3/1(hay là 3)

\(\dfrac{10}{12}=\dfrac{5}{6}\)        \(\dfrac{8}{12}=\dfrac{2}{3}\)        \(\dfrac{10}{15}=\dfrac{2}{3}\)        \(\dfrac{27}{18}=\dfrac{3}{2}\)        \(\dfrac{24}{36}=\dfrac{4}{6}=\dfrac{2}{3}\)

\(\dfrac{18}{48}=\dfrac{3}{8}\)        \(\dfrac{42}{14}=\dfrac{6}{2}=\dfrac{3}{1}\)

10/12 = 5/6 

8/12 = 2/3 

10/15 = 2/3 

27/18 = 3/2 

18/48 = 3/8 

42/14 = 3 

a )   − 18 − 27 = ( − 18 ) : ( − 9 ) ( − 27 ) : ( − 9 ) = 2 3

b )   45 − 24 = 45 : ( − 3 ) ( − 24 ) : ( − 3 ) = − 15 8

3/5

2/3

9/16

ngu dốt

18/27=2/3

24/32=3/4

15/25=3/5

2/3 , 3/4 , 3/5

1) \(\dfrac{5}{10}=\dfrac{5:5}{10:5}=\dfrac{1}{2}\)

\(\dfrac{-18}{-27}=\dfrac{-18:\left(-9\right)}{-27:\left(-9\right)}=\dfrac{2}{3}\)

\(\dfrac{-42}{105}=\dfrac{-42:21}{105:21}=\dfrac{-2}{5}\)

\(\dfrac{75}{-135}=\dfrac{75:\left(-15\right)}{-135:\left(-15\right)}=\dfrac{-5}{9}\)

\(\dfrac5{10}=\dfrac{5.1}{5.2}=\dfrac12\\\dfrac{-18}{-27}=\dfrac{(-9).2}{(-9).3}=\dfrac23\\\dfrac{-42}{105}=\dfrac{21.(-2)}{21.5}=\dfrac{-2}5\\\dfrac{75}{-135}=\dfrac{(-15).(-5)}{(-15).9}=\dfrac{-5}9\)

`5/10=1/2`

`-18/-27=2/3`

-42/105=-2/5`

`75/-135=-5/9``

18/30=3/10

36/27=4/3

64/80=4/5

45/35=/9/7

ai thấy đúng thì k nha rùi mình k lại cho

\(\frac{18}{30}=\frac{18:6}{30:6}=\frac{3}{5}\)

\(\frac{36}{27}=\frac{36:9}{27:7}=\frac{4}{3}\)

\(\frac{64}{80}=\frac{64:16}{80:16}=\frac{4}{5}\)

\(\frac{45}{35}=\frac{45:5}{35:5}=\frac{9}{7}\)

18/30 = 3/10 lấy tử số và mẫu số chia cho 6 .

36/27 = 4/3 . lấy tử số và mẫu số chia cho 8

64/80 = 4/5 lấy tử số và mẫu số chia cho 16

45/35 = 9/7 lấy tử số và mẫu số chia cho 5

cho nha ^_-

45/100=9/20

12/36=1/3

18/54=1/3

63/27=21/9

21/9=7/3

\(\frac{45}{100}=\frac{9}{20}\)

\(\frac{12}{36}=\frac{1}{3}\)

\(\frac{18}{54}=\frac{1}{3}\)

\(\frac{63}{27}=\frac{21}{9}\)

\(\text{Hok tốt!}\)

\(a,-\frac{9}{12}=-\frac{9:3}{12:3}=-\frac{3}{4}\)

\(\frac{-18}{-24}=\frac{\left(-18\right):\left(-6\right)}{\left(-24\right):\left(-6\right)}=\frac{3}{4}\)

\(-\frac{35}{70}=-\frac{35:35}{70:35}=\frac{1}{2}\)

\(-\frac{9}{27}=-\frac{9:9}{27:9}=-\frac{1}{3}\)

\(b,\frac{1313}{4242}=\frac{1313:101}{4242:101}=\frac{13}{42}\)

\(\frac{-353535}{-424242}=\frac{\left(-353535\right):\left(-70707\right)}{\left(-424242\right):\left(-70707\right)}=\frac{5}{6}\)

\(c,\frac{2^3\times4^3\times5^4}{8^2\times25^3\times7}=\frac{2^3\times4^3\times25^2}{8\times8^2\times25^2\times25\times7}\)         ( 4^3 = 8^2 ; 5^4 = 25^2 )

\(=\frac{1}{25\times7}=\frac{1}{175}\)

\(a.\frac{-9}{-12}=\frac{-9:3}{-12:3}=\frac{-3}{-4}.\)

\(\frac{-18}{-24}=\frac{-18:6}{-24:6}=\frac{-3}{-4}\)

\(\frac{-35}{-70}=\frac{-35:35}{-70:35}=\frac{-1}{-2}\)

\(\frac{-9}{-27}=\frac{-9:9}{-27:9}=\frac{-1}{-3}\)

a) \(\frac{-9}{12}=\frac{-9\div3}{12\div3}=\frac{-3}{4}\)

\(\frac{-18}{-24}=\frac{-18\div\left(-6\right)}{-24\div\left(-6\right)}=\frac{3}{4}\)

\(\frac{-35}{70}=\frac{-35\div35}{70\div35}=\frac{-1}{2}\)

\(\frac{-9}{27}=\frac{-9\div9}{27\div9}=\frac{-1}{3}\)

b) \(\frac{1313}{4242}=\frac{1313\div101}{4242\div101}=\frac{13}{42}\)

\(\frac{-353535}{-424242}=\frac{-353535\div\left(-70707\right)}{-424242\div\left(-70707\right)}=\frac{5}{6}\)

c)\(\frac{2^3\times4^3\times5^4}{8^2\times25^3\times7}\)= \(\frac{2^3\times4^3\times5^4}{\left(2^3\right)^2\times\left(5^2\right)^3\times7}\)= \(\frac{2^3\times4^3\times5^4}{2^6\times5^6\times7}\)= \(\frac{2^3\times4^3\times5^4}{2^3\times2^3\times5^2\times5^4\times7}\)= \(\frac{2^3\times2^3}{2^3\times5^2\times7}\)= \(\frac{8}{25\times7}\)= \(\frac{8}{175}\)

a) 27 / 36 = 27 : 9 / 36 : 9 = 3/4

b) 72/96 = 72 : 24 / 96 : 24 = 3/4

c) 55 / 110 = 55 : 55 / 110 : 55 = 1/2

d) 88 / 99 = 88 : 11 / 99 : 11 = 8/9