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27 tháng 12 2017
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28 tháng 12 2017
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4 tháng 11 2021
b: \(=\dfrac{2}{7}-\dfrac{3}{7}\cdot\dfrac{-2}{3}=\dfrac{2}{7}+\dfrac{2}{7}=\dfrac{4}{7}\)
c: \(=\dfrac{3}{7}-\dfrac{7}{2}-\dfrac{3}{7}+\dfrac{7}{2}=0\)
5 tháng 2 2022
Bài 2:
a: \(\Leftrightarrow x=\dfrac{29}{60}\cdot\dfrac{-7}{5}=\dfrac{-203}{300}\)
b: \(\Leftrightarrow x\cdot\dfrac{2}{5}=\dfrac{29}{60}-\dfrac{3}{4}=\dfrac{29-45}{60}=\dfrac{-16}{60}=\dfrac{-8}{30}\)
\(\Leftrightarrow x=\dfrac{-8}{30}:\dfrac{2}{5}=\dfrac{-8\cdot5}{30\cdot2}=\dfrac{-40}{60}=-\dfrac{2}{3}\)
= 15625 nhé
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