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\(b,\left(2x+1\right).\left(39-2\right)=-55\)
\(\Rightarrow\left(2x+1\right).37=-55\)
\(\Rightarrow3x+1=-\frac{55}{37}\)
\(\Rightarrow3x=-\frac{92}{37}\)
\(\Rightarrow x=-\frac{92}{111}\)
\(c,\left(x-7\right)\left(x+3\right)< 0\)
\(\Rightarrow\orbr{\begin{cases}x-7>0;x+3< 0\\x-7< 0;x+3>0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x>7;x< -3\\x< 7;x>-3\end{cases}}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{x}{5}-\frac{3}{7}=\frac{10}{13}\)
\(\Rightarrow\frac{91x}{455}-\frac{195}{455}=\frac{350}{455}\)
\(\Rightarrow91x-195=350\)
\(\Rightarrow91x=545\)
\(\Rightarrow x=\frac{545}{91}\)
\(\frac{-3x}{4}+\frac{1}{3}=\frac{11}{5}\)
\(\Rightarrow\frac{-45x}{60}+\frac{20}{60}=\frac{132}{60}\)
\(\Rightarrow-45x+20=132\)
\(\Rightarrow-45x=112\)
\(\Rightarrow x=-\frac{112}{45}\)
\(3x.\left(x-\frac{11}{7}\right)=0\)
=> \(\orbr{\begin{cases}3x=0\\x-\frac{11}{7}=0\end{cases}}=>\orbr{\begin{cases}x=0\\x=\frac{11}{7}\end{cases}}\)
Chú ý :
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