4/6=2/3

9/12=3/4

10/20=1/2

8/18=4/9

          BẠN CHO MÌNH NHA

2/3 ; 3/4 ; 1/2 ; 4/9

ủng hộ mình lên 100 nha

\(\frac{4}{6}=\frac{4:2}{6:2}=\frac{2}{3};\frac{9}{12}=\frac{9:3}{12:3}=\frac{3}{4};\frac{10}{20}=\frac{10:10}{20:10}=\frac{1}{2};\frac{8}{18}=\frac{8:2}{18:2}=\frac{4}{9}\) 

\(a.-\dfrac{1}{2}\)

\(b.3\)

\(c.5\)

Bài 1: 

a: 6/9=2/3

6/24=1/4

48/96=1/2

42/98=3/7

b: 24/36=2/3

18/30=3/5

15/120=1/8

80/240=1/3

c: 5/25=1/5

75/100=3/4

64/720=4/45

16/1000=2/125

Bài 2: 

Các phân số bằng 2/3 là 34/51; 20/30; 84/126

Bài 1 : 

a) 6/9 = 2/3 ; 6/24 = 1/4 ; 48/96 = 1/2 ; 42/98 = 3/7

b) 24/36 = 2/3 ; 18/30 = 3/5 ; 15/120 = 1/8 ; 80 / 240 = 1/3

c) 5 / 25 = 1/5 ; 75/100=3/4 ; 64/720=4/45 ; 16/1000=2/125

Bài 2 :

Các phân số bằng 2/3 là :

 \(\text{34/51; 20/30; 84/126}\)

a) \(\dfrac{6}{14}=\dfrac{6:2}{14:2}=\dfrac{3}{7}\)

\(\dfrac{3}{7}< \dfrac{4}{7}\)

b) \(\dfrac{6}{15}=\dfrac{6:3}{15:3}=\dfrac{2}{5}\)

\(\dfrac{3}{5}>\dfrac{2}{5}\)

c) \(\dfrac{10}{18}=\dfrac{10:2}{18:2}=\dfrac{5}{9}\)

\(\dfrac{5}{9}>\dfrac{2}{9}\)

\(\frac{6}{9}=\frac{6:3}{9:3}=\frac{2}{3}\)

\(\frac{18}{48}=\frac{18:6}{48:6}=\frac{3}{8}\)

\(\frac{72}{84}=\frac{72:12}{84:12}=\frac{6}{7}\)

\(\frac{60}{120}=\frac{60:60}{120:60}=\frac{1}{2}\)

\(\frac{6}{9}=\frac{6\div3}{9\div3}=\frac{2}{3}\)

\(\frac{18}{48}=\frac{18\div6}{48\div6}=\frac{3}{8}\)

\(\frac{72}{84}=\frac{72\div12}{84\div12}=\frac{6}{7}\)

\(\frac{60}{120}=\frac{60\div60}{120\div60}=\frac{1}{2}\)

\(\frac{1+2+3+4+...+8+9}{11+12+...+18+19}\)

\(\Rightarrow\frac{\left(1+9\right).9:2}{\left(11+9\right).9:2}=\frac{1+9}{11+19}=\frac{10}{30}=\frac{1}{3}\)

B

`=>B`

b