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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)\(\dfrac{\dfrac{2}{9}}{0,31}=\dfrac{2}{9}:\dfrac{31}{100}=\dfrac{2}{9}.\dfrac{100}{31}=\dfrac{31}{450}=31:450\)
a) 1,5 : 2,16
\(=\frac{15}{10}:\frac{216}{100}=\frac{3}{2}:\frac{54}{25}=\frac{3}{2}.\frac{25}{54}=\frac{25}{36}=25:36\)
Các câu còn lại lm tương tự
Thay tỉ số giữa các số hữu tỉ bằng tỉ số giữa các số nguyên:
a, 1,5 : 2,16
b, 30/7 : 3/5
c, 2/9 : 0,31
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) \(\frac{2}{9}:0,31=\frac{2}{9}.\frac{1}{0,31}=\frac{200}{279}\)
Bài làm:
1)
Ta có:
a) \(1,5\div2,16=\frac{25}{36}\)
b) \(4\div\frac{\frac{2}{7}}{\frac{3}{5}}=\frac{42}{5}\)
c) \(\frac{2}{9}\div0,31=\frac{200}{279}\)
2) Ta có: \(ad=bc\)
\(\Leftrightarrow\frac{ad}{cd}=\frac{bc}{cd}\)
\(\Rightarrow\frac{a}{c}=\frac{b}{d}\)
a) \(1,5:2,16=\frac{15}{10}:\frac{216}{100}=\frac{3}{2}:\frac{54}{25}=\frac{3}{2}.\frac{25}{54}=\frac{25}{36}=25:36\)
b) \(4\frac{2}{7}:\frac{3}{5}=\frac{30}{7}.\frac{5}{3}=\frac{50}{7}=50:7\)
c) \(\frac{2}{9}:0,31=\frac{2}{9}:\frac{31}{100}=\frac{2}{9}.\frac{100}{31}=\frac{200}{279}=200:279\)
a, Ta có : \(1,2=\dfrac{12}{10}=\dfrac{6}{5}\) ; \(3,36=\dfrac{84}{25}\)
=> \(1,2:3,36=\dfrac{6}{5}:\dfrac{84}{25}=\dfrac{5}{14}\)
b, Ta có : \(3\dfrac{1}{7}:2\dfrac{5}{14}=\dfrac{22}{7}:\dfrac{33}{14}=\dfrac{4}{3}\)
c,\(\dfrac{3}{8}:0,54=\dfrac{3}{8}:\dfrac{27}{50}=\dfrac{25}{36}\)
a) \(1,2:3,36=\dfrac{6}{5}:\dfrac{84}{25}=\dfrac{5}{14}\)
b)\(3\dfrac{1}{7}:2\dfrac{5}{14}=\dfrac{22}{7}:\dfrac{33}{14}=\dfrac{4}{3}\)
c)\(\dfrac{3}{8}:0,54=\dfrac{3}{8}:\dfrac{27}{50}=\dfrac{25}{36}\)
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.
\(\frac{2}{9}: 0,3=\frac{2}{9}: \frac{3}{10}=\frac{2}{9}.\frac{10}{3}=\frac{20}{27}\)