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

\(\frac{1}{4}=\frac{1x3}{4x3}=\frac{3}{12}\)

\(\frac{5}{6}=\frac{5x2}{6x2}=\frac{10}{12}\)

Chúc bạn học tốt.

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Cảm ơn bạn nhiều!

1/4=3/12

5/6=10/12

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: \(MSC:24\\ \dfrac{1}{3}=\dfrac{1\times8}{3\times8}=\dfrac{8}{24};\dfrac{1}{4}=\dfrac{1\times6}{4\times6}=\dfrac{6}{24}\)

b: \(MSC:24\\ \dfrac{5}{12}=\dfrac{5\times2}{12\times2}=\dfrac{10}{24};\dfrac{7}{6}=\dfrac{7\times4}{6\times4}=\dfrac{28}{24}\)

Đây nè:

\(a,\dfrac{1}{3};\dfrac{1}{4}và\dfrac{1}{24}\)

\(\dfrac{1}{3}=\dfrac{1\times8}{3\times8}=\dfrac{8}{24};\dfrac{1}{4}=\dfrac{1\times6}{4\times6}=\dfrac{6}{24};\dfrac{1}{24}\)

\(b,\dfrac{5}{12};\dfrac{7}{6}và\dfrac{5}{24}\)

\(\dfrac{5}{12}=\dfrac{5\times2}{12\times2}=\dfrac{10}{24};\dfrac{7}{6}=\dfrac{7\times4}{6\times4}=\dfrac{28}{24};\dfrac{5}{24}\)

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. \(\dfrac{2}{3}=\dfrac{2.5}{3.5}=\dfrac{10}{15};\dfrac{1}{5}=\dfrac{1.3}{5.3}=\dfrac{3}{15}\)

b.\(\dfrac{3}{4}=\dfrac{3.2}{4.2}=\dfrac{6}{8};\dfrac{5}{8}=\dfrac{5}{8}\)

\(\dfrac{5}{6}=\dfrac{5.3}{6.3}=\dfrac{15}{18};\dfrac{4}{9}=\dfrac{4.2}{9.2}=\dfrac{8}{18}\)

a: 1/54=1/54

5/6=45/54

b: 3/22=3/22

6/11=12/22

c: 1/2=6/12

2/3=8/12

3/4=9/12

\(1,\\ \dfrac{3}{5}=\dfrac{21}{35};\dfrac{4}{7}=\dfrac{20}{35}\\ \dfrac{2}{3}=\dfrac{4}{6};\dfrac{5}{6}=\dfrac{5}{6}\\ \dfrac{4}{9}=\dfrac{8}{18};\dfrac{1}{6}=\dfrac{3}{18}\\ 2,\\ \dfrac{5}{9}=\dfrac{10}{18};\dfrac{7}{8}=\dfrac{14}{16};\dfrac{24}{42}=\dfrac{12}{21}\)

1. \(\dfrac{3}{5}=\dfrac{21}{35};\dfrac{4}{7}=\dfrac{20}{35}\)

\(\dfrac{2}{3}=\dfrac{4}{6};\dfrac{5}{6}=\dfrac{5}{6}\)

\(\dfrac{4}{9}=\dfrac{16}{36};\dfrac{1}{6}=\dfrac{6}{36}\)

2. \(\dfrac{5}{9}=\dfrac{10}{18}\)

\(\dfrac{7}{8}=\dfrac{14}{16}\)

\(\dfrac{24}{42}=\dfrac{12}{21}\)