Quang Đức
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2024-05-02 10:39:54
\(\left(2x-3\right)\left(\dfrac{5}{4}x-6\right)=0\)
\(\Rightarrow2x-3=0\) hoặc \(\dfrac{5}{4}x-6=0\)
\(\Rightarrow x=\dfrac{3}{2}\) và \(x=\dfrac{24}{5}\)
2024-05-02 10:30:12
\(\dfrac{72.100}{60}\text{%}=120\%\)
2024-05-02 10:19:45
\(2019\left(2020-164\right)-2020\left(2019-164\right)\)
\(\Leftrightarrow\left(2019.2020-2019.164\right)-\left(2020.2019-2020.164\right)\)
\(\Leftrightarrow2019.2020-2019.164-2020.2019+2020.164\)
\(\Leftrightarrow\left(2019.2020-2020.2019\right)-\left(2019.164-2020.164\right)\)
\(\Leftrightarrow2020.164-2019.164\)
\(\Leftrightarrow164\left(2020-2019\right)\)
\(\Leftrightarrow164.1=164\)