\(\dfrac{3}{4}=\dfrac{3\cdot9}{4\cdot9}=\dfrac{27}{36}\)

\(\dfrac{5}{6}=\dfrac{5\cdot6}{6\cdot6}=\dfrac{30}{36}\)

\(\dfrac{4}{9}=\dfrac{4\cdot4}{9\cdot4}=\dfrac{16}{36}\)

bài3

1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)

\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)

2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)

\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)

3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)

\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)

4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)

\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)

TL

Phân số là 3/45/4

HT

Dễ mà bạn

\(\frac{5}{6}=\frac{5}{6};\frac{1}{3}=\frac{3}{6}\)

\(\frac{1}{4}=\frac{10}{40};\frac{9}{10}=\frac{36}{40}\)

5/6 và 1/3 

1/3 = 2/6 giữ nguyên 5/6

1/4 và 9/10

1/4 = 5/20 ; 9/10 = 18/20

a: 2/3=10/15

1/5=3/15

b: 3/4=6/8

5/8=5/8

c: 5/6=15/18

4/9=8/18

\(\dfrac{2}{3}=\dfrac{10}{15};\dfrac{1}{5}=\dfrac{3}{15}\)

\(\dfrac{3}{4}=\dfrac{24}{32};\dfrac{5}{8}=\dfrac{20}{32}\)

\(\dfrac{5}{6}=\dfrac{45}{54};\dfrac{4}{9}=\dfrac{24}{54}\)

a: 3/4=6/8

7/8=7/8

me ko nhắn

>:(

\(a,=\dfrac{15}{55};\dfrac{44}{55}\)

\(b,=\dfrac{7}{9};\dfrac{12}{9}\)

\(c=\dfrac{3}{6};\dfrac{2}{6};\dfrac{1}{6}\)