Câu 8:
a: \(\dfrac{5}{6}=\dfrac{5\left(x-1\right)}{6\left(x-1\right)}\)
\(\dfrac{x-2}{3\left(x-1\right)}=\dfrac{2x-4}{6\left(x-1\right)}\)
b: \(\dfrac{2}{5x+5}=\dfrac{6}{15\left(x+1\right)}\)
\(\dfrac{x+2}{3x+3}=\dfrac{x+2}{3\left(x+1\right)}=\dfrac{5x+10}{15\left(x+1\right)}\)
c: \(\dfrac{1}{2x}=\dfrac{5\left(x+1\right)}{10x\left(x+1\right)}\)
\(\dfrac{5}{10x+10}=\dfrac{5}{10\left(x+1\right)}=\dfrac{5x}{10x\left(x+1\right)}\)
\(\dfrac{x+7}{5x^2+5x}=\dfrac{x+7}{5x\left(x+1\right)}=\dfrac{2x+14}{10x\left(x+1\right)}\)
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