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a) \(\dfrac{-7}{20}=\dfrac{1}{5}.\dfrac{-7}{4}\) b) \(\dfrac{-7}{20}=\dfrac{-7}{40}:\dfrac{1}{2}\) c) \(\dfrac{-7}{20}=\dfrac{2}{5}+\dfrac{-3}{4}\) d) \(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)
a)\(\dfrac{-7}{20}=\dfrac{-7}{10}\times\dfrac{1}{2}\)
b)\(\dfrac{-7}{20}=\dfrac{-7}{40}\times\dfrac{1}{2}\)
c)\(\dfrac{-7}{20}=\dfrac{7}{20}+\dfrac{-7}{10}\)
d)\(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)
a)
\(\frac{-7}{20}=\frac{-7}{3}.\frac{3}{20}\)
b)
\(\frac{-7}{20}=\frac{-7}{3}:\frac{20}{3}\)
c)
\(\frac{-2}{5}+\frac{1}{20}\)
a) \(\frac{7}{2}.\frac{-1}{10}\)
b)\(7:\left(-20\right)\)
c)\(\frac{7}{20}+\frac{-7}{10}\)
d)\(\frac{-1}{5}+\frac{-3}{20}\)
Hãy viết số hữu tỉ 1/7 dưới các dạng sau :
a) Tích của hai số hữu tỉ âm
b) Thương của hai số hữu tỉ âm
a)\(\dfrac{-3}{15}+\dfrac{-5}{15}\)
b)\(\dfrac{4}{3}-\dfrac{4}{5}\)
c)\(-1+\dfrac{7}{15}\)
d)\(\dfrac{-1}{15}-\dfrac{7}{15}\)
a: \(\dfrac{-8}{15}=\dfrac{-6}{15}+\dfrac{-2}{15}\)
\(\dfrac{-8}{15}=\dfrac{-3}{15}+\dfrac{-5}{15}\)
\(\dfrac{-8}{15}=\dfrac{-1}{15}+\dfrac{-7}{15}\)
b: \(\dfrac{-8}{15}=\dfrac{16}{15}-\dfrac{24}{15}\)
\(\dfrac{-8}{15}=\dfrac{22}{15}-\dfrac{30}{15}\)
\(\dfrac{-8}{15}=\dfrac{9}{15}-\dfrac{17}{15}\)
a: \(-\dfrac{4}{15}=\dfrac{5}{15}-\dfrac{9}{15}=\dfrac{1}{3}-\dfrac{3}{5}=\dfrac{1}{3}+\left(-\dfrac{3}{5}\right)\)
b: \(\dfrac{-4}{15}=\dfrac{-2\cdot2}{3\cdot5}=\dfrac{-2}{3}\cdot\dfrac{2}{5}\)
c: \(\dfrac{-4}{15}=\dfrac{-2}{3}\cdot\dfrac{2}{5}=\dfrac{-2}{3}:\dfrac{5}{2}\)
a) \(-\dfrac{4}{15}=\left(-1\right)+\dfrac{11}{15}\)
b) \(-\dfrac{4}{15}=\left(-\dfrac{2}{3}\right).\dfrac{2}{5}\)
c) \(-\dfrac{4}{15}=\left(-\dfrac{2}{3}\right):\dfrac{5}{2}\)