\(\dfrac{1}{11}\) + \(\dfrac{1}{12}\) + \(\dfrac{1}{13}\) + ... + \(\dfrac{1}{70}\)
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\(\dfrac{2}{6}< ...< \dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{2}{6}< ...< \dfrac{4}{6}\)
\(\Rightarrow\) Số đó là: \(\dfrac{3}{6}=\dfrac{1}{2}\)
\(\dfrac{4}{5}\times2=1,6\left(giờ\right)=96\left(phút\right)\)
Chọn c
\(\dfrac{1}{2}x=-\dfrac{3}{10}-\dfrac{3}{4}=-\dfrac{21}{20}\)
\(x=-\dfrac{21}{20}:\dfrac{1}{2}=-\dfrac{21}{10}\)
\(\dfrac{1}{2}\)x = \(\dfrac{-3}{10}\) - \(\dfrac{3}{4}\)
\(\dfrac{1}{2}\)x = -\(\dfrac{21}{20}\)
x = -\(\dfrac{21}{20}\):\(\dfrac{1}{2}\)
x = -\(\dfrac{21}{10}\)
\(20,22\times18,6+20,22\times0,394+40,4\times21\)
\(=20,22\times\left(18,6+0,394\right)+40,4\times21\)
\(\approx384,06+848,4=1232,46\)
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giúp mình nhé
\(\dfrac{3}{8}\) + \(\dfrac{1}{8}\) = \(\dfrac{3+1}{8}\) = \(\dfrac{1}{2}\)