a. 1,2 : 3,24 = \(\frac{1,2}{3,24}\)= \(\frac{120}{324}\)=\(\frac{120:12}{324:12}\)=\(\frac{10}{27}\)

b. 215 : 34215 : 34 = \(\frac{215}{34215}\). \(\frac{1}{34}\)=\(\frac{43}{6843}\).\(\frac{1}{34}\)=\(\frac{43}{232662}\)

c. 27 : 0,42 = 27 : \(\frac{42}{100}\)= 27 : \(\frac{21}{50}\)= 27 . \(\frac{50}{21}\)= \(\frac{27.50}{21}\)=\(\frac{9.50}{7}\)=\(\frac{450}{7}\)

a đúng bc sai

I'm sorry Phung Minh Quan

A)1,2 : 3,24                    b) \(2\frac{1}{5}\) : \(\frac{3}{4}\)                                    c)\(\frac{2}{7}\) : 0,42

     \(\frac{12}{10}\) : \(\frac{324}{100}\)                          \(\frac{11}{5}\) : \(\frac{3}{4}\)                                    \(\frac{2}{7}\) : \(\frac{42}{100}\)

a) 1,2: 3,24 = 120 : 324 = 10:27

b) =

c) =

a, 1,2 : 2,24 = \(\frac{1,2}{2,24}=\frac{120}{224}=\frac{15}{28}\)

b, (2 + \(\frac{1}{5}\)) : \(\frac{3}{4}\)= \(\frac{11}{5}:\frac{3}{4}\)= \(\frac{44}{15}\)

c, \(\frac{2}{7}\): 0,42 =\(\frac{2}{7}:\frac{42}{10}=\frac{10}{147}\)

a) \(\frac{10}{27}\)

b)\(\frac{44}{15}\)

c)\(\frac{100}{147}\)

tích đúng cho mình nhé bạn

a)\(\frac{10}{27}\)

b) \(\frac{44}{15}\)

c) \(\frac{100}{147}\)

a)  \(1,2\div3,24=10\div27\)

b)  \(\frac{2}{7}\div0,42=100\div147\)

p/s: chúc bạn học tốt

Ta có :

\(1.2:3.24=\frac{1.2}{3.24}=\frac{10}{27}\)

\(\frac{2}{7}:0.42=\frac{2}{7}:\frac{21}{50}=\frac{2}{7}\cdot\frac{50}{21}=\frac{100}{147}\)

a) 1,2 : 3,24 = \(\frac{6}{5}:\frac{81}{25}\)= \(\frac{6}{5}.\frac{25}{81}=\frac{10}{27}\)= 10 : 27

b) \(\frac{2}{7}:0,42=\frac{2}{7}:\frac{21}{50}\)\(=\frac{2}{7}.\frac{50}{21}=\frac{100}{147}\)= 100 : 147

a)10/27

b)28/5

c)25/21

Chúc bạn học tốt

Chỉ cách làm luôn nha