nhanh thì mình tick :)

a) \(\dfrac{3}{4}=\dfrac{3\cdot25}{4\cdot25}=\dfrac{75}{100}=0,75\)

b) \(\dfrac{29}{25}=\dfrac{29\cdot4}{25\cdot4}=\dfrac{116}{100}=1,16\)

c) \(\dfrac{24}{20}=\dfrac{24:2}{20:2}=\dfrac{12}{10}=1,2\)

\(\dfrac{3}{4}=\dfrac{3x25}{4x25}=\dfrac{75}{100}=0,75\)

\(\dfrac{29}{25}=\dfrac{29x4}{25x4}=\dfrac{116}{100}=1,16\)

\(\dfrac{24}{20}=\dfrac{12}{10}=1,2\)

a)\(3\frac{2}{5}.2\frac{1}{7}=\frac{17}{5}.\frac{15}{7}=\frac{51}{7}\)

b) \(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{49}{6}.\frac{2}{5}=\frac{49}{15}\)

a  17/5*21/7=457/35

b 49/6:21/2=88/126

Chuyển các hỗn số thành p/s rồi thực hiện phép tính (theo mẫu):

a) \(3\frac{2}{5}\times2\frac{1}{7}=\frac{17}{5}\times\frac{15}{7}=\frac{51}{7}\)

b) \(8\frac{1}{6}\div2\frac{1}{2}=\frac{49}{6}\div\frac{5}{2}=\frac{49}{6}\times\frac{2}{5}=\frac{49}{15}\)

help me

a: 1/3=20/60

1/4=15/60

4/5=48/60

b: 1/2=6/12

2/3=8/12

3/4=9/12

3 2 5   x   2 1 7 = 17 5   x   15 7 = 51 7

2 1 3   x   5 1 4 = 7 3   x   21 4 = 49 4

8 , 06   = 8 6 100   ;               72 , 308   =   72 308 1000   ;             20 , 006 = 20 6 1000

3 , 5   =   3 5 10 ;               7 , 9 = 7 9 10 ;             12 , 35 = 12 35 100