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\(\dfrac{-188}{2017}< 0;\dfrac{1}{3678}>0\\ \Rightarrow\dfrac{-188}{2017}< \dfrac{1}{3678}\)
\(\dfrac{x+50}{49}+\dfrac{x+2}{48}+\dfrac{x+50}{47}=-1\)
\(\dfrac{x+50}{49}+\left(\dfrac{x+2}{48}+1\right)+\dfrac{x+50}{47}=0\)
\(\dfrac{x+50}{49}+\dfrac{x+50}{48}+\dfrac{x+50}{47}=0\)
\(\left(x+50\right)\left(\dfrac{1}{49}+\dfrac{1}{48}+\dfrac{1}{47}\right)=0\)
\(\Leftrightarrow x=-50\) Vì \(\left(\dfrac{1}{49}+\dfrac{1}{48}+\dfrac{1}{47}\right)>0\)
Trl :
2x + 5x + 7x = 22.7
14x = 4.7
14x = 28
x= 28 : 14
x = 2
Hok tốt
\(=\dfrac{9}{4}\cdot\dfrac{-2}{7}+\dfrac{9}{4}\cdot\dfrac{9}{7}=\dfrac{9}{4}\left(-\dfrac{2}{7}+\dfrac{9}{7}\right)=\dfrac{9}{4}\)
\(\dfrac{2x-3}{4}.\dfrac{6}{5}=\dfrac{21}{10}\\ \Leftrightarrow\dfrac{2x-3}{4}=\dfrac{7}{4}\\ \Leftrightarrow2x-3=7\\ \Leftrightarrow2x=10\\ \Leftrightarrow x=5\)