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

Sao lại thế

a: 3/4=6/8

7/8=7/8

me ko nhắn

Bài 3 : 

a: \(MSC:12\\ \dfrac{4}{3}=\dfrac{4\times4}{3\times4}=\dfrac{16}{12};\dfrac{3}{4}=\dfrac{3\times3}{3\times4}=\dfrac{9}{12}\)

b: \(MSC:12\\ \dfrac{5}{4}=\dfrac{5\times3}{4\times3}=\dfrac{15}{12};\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12}\)

c:\(MSC:24\\ \dfrac{3}{8}=\dfrac{3\times3}{8\times3}=\dfrac{9}{24};\dfrac{1}{6}=\dfrac{1\times2}{6\times2}=\dfrac{2}{12}\)

d: \(MSC:35\\ \dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{35};\dfrac{4}{7}=\dfrac{4\times5}{7\times5}=\dfrac{20}{35}\)

Bài 3: 

a: 4/3=16/12

3/4=9/12

b: 5/4=30/24

5/6=20/24

c: 3/8=18/48

1/6=8/48

d: 2/5=14/35

4/7=20/35

Bài 4: 

a: 7/12=28/48

5/48=5/48

b: 4/100=4/100

8/25=32/100

20/35

a, 9/12 và 8/12

b, 40/50 và 35/50

9/12 và 8/12

8/10 và 7/10

\(\dfrac{3}{4};\dfrac{2}{3}\left(MSC:12\right)\)

\(\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12};\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12}\)

\(\dfrac{4}{5};\dfrac{7}{10}\left(MSC:10\right)\)

\(\dfrac{4}{5}=\dfrac{4\times2}{5\times2}=\dfrac{8}{10};\dfrac{7}{10}\)(giữ nguyên)

a: 4/3=32/24

5/8=15/24

b: 4/5=36/45

5/9=25/45

c: 4/9=16/36

7/12=21/36

d: 1/2=6/12

2/3=8/12

7/12=7/12

4/3 và 5/8 

\(\dfrac{4}{3}=\dfrac{4x8}{3x8}=\dfrac{32}{24}\)

 \(\dfrac{5}{8}=\dfrac{5x3}{8x3}=\dfrac{15}{24}\)

4/5 và 5/9 

\(\dfrac{4}{5}=\dfrac{4x9}{5x9}=\dfrac{36}{45}\)

\(\dfrac{5}{9}=\dfrac{5x5}{9x5}=\dfrac{25}{45}\)

4/9 và 7/12 

  \(\dfrac{4}{9}=\dfrac{4x12}{9x12}=\dfrac{48}{108}\)

\(\dfrac{7}{12}=\dfrac{7x9}{12x9}=\dfrac{63}{108}\)

1/2 ; 2/3 và 7/12 

\(\dfrac{1}{2}=\dfrac{1x6}{2x6}=\dfrac{6}{12}\)

\(\dfrac{2}{3}=\dfrac{2x4}{3x4}=\dfrac{8}{12}\)

\(\dfrac{7}{12}=\dfrac{7x1}{12x1}=\dfrac{7}{12}\)

ko

35/40>16/40

1/12<9/12

16/28<42/28>35/28

4/15<9/15<10/15

Chúc em học tốt

\(\dfrac{35}{40}>\dfrac{16}{40}\)

\(\dfrac{1}{12}< \dfrac{9}{12}\)

\(\dfrac{16}{28}< \dfrac{42}{28}>\dfrac{35}{28}\)

\(\dfrac{4}{15}< \dfrac{9}{15}< \dfrac{10}{15}\)

5/3 và 6/3

63/36 và 56/36

9/6 và 10/6

a,\(=\dfrac{5}{3}\)và\(\dfrac{6}{3}\)
b,\(=\dfrac{63}{36}\)và\(\dfrac{56}{36}\)
c,\(=\dfrac{9}{6}\)và\(\dfrac{10}{6}\)

đây là lớp 4 mà :)?