Question

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Answer 1

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Answer 2

Bài 3 : 

a, \(x=-\dfrac{11}{6}+\dfrac{5}{4}=\dfrac{-44+30}{24}=-\dfrac{14}{24}=-\dfrac{7}{12}\)

b, \(3x-9=-12\Leftrightarrow x=-1\)

c, \(-\dfrac{2}{5}x=\dfrac{16}{15}-\dfrac{1}{5}=\dfrac{13}{15}\Leftrightarrow x=\dfrac{13}{15}:\left(-\dfrac{2}{5}\right)=\dfrac{-13}{6}\)