\(\dfrac{3}{2}=\dfrac{3\times225}{2\times225}=\dfrac{675}{450}\)

\(\dfrac{7}{9}=\dfrac{7\times50}{9\times50}=\dfrac{350}{450}\)

\(\dfrac{4}{25}=\dfrac{4\times18}{25\times18}=\dfrac{72}{450}\).

\(\dfrac{3}{2}\text{=}\dfrac{3\times225}{2\times225}\text{=}\dfrac{675}{450}\)

\(\dfrac{7}{9}\text{=}\dfrac{7\times50}{9\times50}\text{=}\dfrac{350}{450}\)

\(\dfrac{4}{25}\text{=}\dfrac{4\times18}{25\times18}\text{=}\dfrac{72}{450}\)

\(\dfrac{11}{12}=\dfrac{11.4}{12.4}=\dfrac{44}{48}\) và \(\dfrac{7}{48}\)

\(\dfrac{61}{200};\dfrac{9}{50}=\dfrac{9.4}{50.4}=\dfrac{36}{200}\)

\(\dfrac{1}{3}=\dfrac{1.15}{3.15}=\dfrac{15}{45}\); \(\dfrac{2}{15}=\dfrac{2.3}{15.3}=\dfrac{6}{45}\) và 4/45

`a,MSC:48`

`11/12 = (11xx4)/(12xx4)=44/48`

`7/48` giữ nguyên

`b, MSC:200`

`61/200` giữ nguyên

`9/50=(9xx4)/(50xx4)=36/200`

`c,MSC:45`

`1/3=(1xx15)/(3xx15)=15/45`

`2/15=(2xx3)/(15xx3)=6/45`

`4/45` giữ nguyên

\(\dfrac{11}{12}=\dfrac{11\times4}{12\times4}=\dfrac{44}{48}\) và \(\dfrac{7}{48}\)

\(\dfrac{61}{200}\) và \(\dfrac{9}{50}=\dfrac{9\times4}{50\times4}=\dfrac{36}{200}\)

\(\dfrac{1}{3}=\dfrac{1\times15}{3\times15}=\dfrac{15}{45}\);\(\dfrac{2}{15}=\dfrac{2\times3}{15\times3}=\dfrac{6}{45}\) và \(\dfrac{4}{45}\)

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

MSC:60 NHA BẠN 

ko bé ơi 

lớp tui có bạn cũng tên Nguyễn Trung Hiếu

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

\(a.\dfrac{3}{4}=\dfrac{3.9}{4.9}=\dfrac{27}{36}\)

\(\dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)

\(b.\dfrac{5}{6}=\dfrac{5.3}{6.3}=\dfrac{15}{18}\) giữ nguyên phân số còn lại

c. \(\dfrac{3}{8}=\dfrac{3.3}{8.3}=\dfrac{9}{24}\)

\(\dfrac{7}{12}=\dfrac{7.2}{12.2}=\dfrac{14}{24}\)

d. \(\dfrac{11}{12}=\dfrac{11.4}{12.4}=\dfrac{44}{48}\)

giữ nguyên phân số còn lại. 

e. \(\dfrac{9}{50}=\dfrac{9.4}{50.4}=\dfrac{36}{200}\)

giữ nguyên phân số còn lại

\(f.\dfrac{1}{3}=\dfrac{1.3}{15.3}=\dfrac{3}{45}\)

\(\dfrac{2}{15}=\dfrac{2.3}{15.3}=\dfrac{6}{45}\)

giữ nguyên phân số còn lại

1/ 7/9 và 4/9

2/ 8/20 và 11/20

3/ 27/75 và 16/75