a)\(\dfrac{5}{25}=\dfrac{1}{5}\)
\(\dfrac{75}{100}=\dfrac{3}{4}\)
\(\dfrac{64}{720}=\dfrac{4}{45}\)
\(\dfrac{16}{1000}=\dfrac{2}{125}\)
b)\(\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{12}{8}=\dfrac{3}{2}\)
\(\dfrac{15}{25}=\dfrac{3}{5}\)
\(\dfrac{11}{22}=\dfrac{1}{2}\)
c)\(\dfrac{5}{10}=\dfrac{1}{2}\)
\(\dfrac{12}{36}=\dfrac{1}{3}\)

\(\dfrac{9}{72}=\dfrac{1}{8}\)

\(\dfrac{75}{300}=\dfrac{1}{4}\)
d)\(\dfrac{14}{28}=\dfrac{1}{2}\)
\(\dfrac{25}{50}=\dfrac{1}{2}\)
\(\dfrac{48}{30}=\dfrac{8}{5}\)
\(\dfrac{81}{54}=\dfrac{3}{2}\)

a: 5/25=1/5

75/100=3/4

64/720=4/45

16/1000=2/125

b: 4/6=2/3

12/8=3/2

15/25=3/5

11/22=1/2

c: 5/10=1/2

12/36=1/3

9/72=1/8

75/300=1/4

d: 14/28=1/2

25/50=1/2

48/30=8/5

81/54=3/2

`a)` Phân số tối giản là: \(\dfrac{2}{3};\dfrac{5}{4};\dfrac{11}{12}\)

`b)` Phân số rút gọn được là: \(\dfrac{28}{14};\dfrac{69}{54}\)

  \(\dfrac{28}{14}=\dfrac{28:14}{14:14}=2\)

 \(\dfrac{69}{54}=\dfrac{69:3}{54:3}=\dfrac{23}{18}\)

a, phân số tối giản là 2/3; 11/12; 5/4

b, phân số rút gọn được là 28/14=2; 69/54=16/9

\(\Leftrightarrow\dfrac{1}{2};\dfrac{1}{2};\dfrac{8}{5};\dfrac{3}{2}\)

14/28=1/2

25/50=1/2

48/30=8/5

81/54=3/2

14/28=1/2

25/30=5/6

48/30=8/5

81/54=3/2

14/28=1/2

25/30=5/6

48/30=8/5

81/54=3/2 

25/50=25:25/50:25=1/2 

81/54=81:27/54:27=3/2

y=41/45

8/15

m=33/20

21/22 nhé

6/7

21/35 và 20/35 nhé

18/54=1/3
25/75=1/3
48/30=8/5

1/3

1/3

8/5

a, 18/54 = 1/3 

b, 1/3 = 1/5 +2/15

a) \(\frac{18}{54}=\frac{1}{3}\)

b) \(\frac{18}{54}=\frac{1}{5}+\frac{2}{15}\)

~Học tốt~

giúp mình nhé

a. (36+54)x7+7x9+7

=7x90+7x(9+1)

=7x(90+10)

=7x100

=700