a) 2,04:(-3,12)              c)4:5 3/4

   =-17/23                      = 3/5

b) (-11/2):1,25              d)10 3/7:5 3/14

   =-22/5                         =9/49

Thay tỉ số [-1 1/2].. 1,25 bằng tỉ số nguyên ta được

A /5/6 B /-6/5 C/6/5 D /-5/6

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

Lời giải:

$3:0,02=\frac{3}{0,02}=\frac{300}{2}=\frac{150}{1}$

a)10/27

b)28/5

c)25/21

Chúc bạn học tốt

Chỉ cách làm luôn nha

\(a,0,7:1,5=\frac{7}{10}:\frac{15}{10}=\frac{7}{10}\cdot\frac{10}{15}=\frac{7}{15}\)

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

\(c,3:0,02=3:\frac{2}{100}=3\cdot\frac{100}{2}=150\)

a) 2,04 : ( -3,12 )

= 2,04/-3,12 = 204/-312 = -204/312 = -17/26

a) \(3,7:4,5=\dfrac{3,7}{4,5}=\dfrac{37}{45}\)

b) \(2\dfrac{1}{3}:4\dfrac{2}{3}=\dfrac{7}{3}:\dfrac{14}{3}=\dfrac{7}{3}\times\dfrac{3}{14}=\dfrac{1}{2}\)

c) \(\dfrac{3}{8}:0,7=\dfrac{3}{8}:\dfrac{7}{10}=\dfrac{3}{8}\times\dfrac{10}{7}=\dfrac{15}{28}\)

d) \(5\dfrac{1}{7}:2\dfrac{1}{3}=\dfrac{36}{7}:\dfrac{7}{3}=\dfrac{36}{7}\times\dfrac{3}{7}=\dfrac{108}{49}\)