a: \(1.5:2.16=\dfrac{25}{36}\)

b: \(\dfrac{3}{8}:0.54=\dfrac{25}{36}\)

c: \(-0.375:3.63=-\dfrac{25}{242}\)

a) \(1,5:2,16=\frac{1,5}{2,16}=\frac{25}{36}\)

b) \(\frac{30}{7}:\frac{3}{5}=\frac{30}{7}.\frac{5}{3}=\frac{50}{7}\)

c) \(\frac{2}{9}:0,31=\frac{2}{9}.\frac{1}{0,31}=\frac{200}{279}\)

a) − 6 25 ;                    b) 2 11                               c)  5 6

a.1,5:2,16=25:36

b.2/9 :0,31=200:279

Lời giải:

a.

\(1,5:2,16=\frac{15}{10}: \frac{216}{100}=\frac{3}{2}: \frac{54}{25}=\frac{3}{2}.\frac{25}{54}=\frac{25}{36}\)

b.

\(4\frac{2}{7}: \frac{3}{5}=\frac{30}{7}:\frac{3}{5}=\frac{30}{7}.\frac{5}{3}=\frac{50}{7}\)

c.

\(\frac{2}{9}: 0,3=\frac{2}{9}: \frac{3}{10}=\frac{2}{9}.\frac{10}{3}=\frac{20}{27}\)

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

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

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

1,5 : 2,16 = 150 : 216 = 25 : 36

a)\(1,5:2,16=15:216=5:72\)

b)\(4\dfrac{2}{7}:\dfrac{3}{5}=\dfrac{30}{7}:\dfrac{3}{5}=\dfrac{30}{7}.\dfrac{5}{3}=\dfrac{50}{7}=50:7\)

c)\(\dfrac{\dfrac{2}{9}}{0,31}=\dfrac{2}{9}:\dfrac{31}{100}=\dfrac{2}{9}.\dfrac{100}{31}=\dfrac{31}{450}=31:450\)