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\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{5+2}{12}=\dfrac{7}{12}\)
\(\dfrac{5}{12}+\dfrac{1}{6}=\dfrac{5}{12}+\dfrac{2}{12}=\dfrac{7}{12}\)
\(1-\dfrac{23}{47}=\dfrac{47}{47}-\dfrac{23}{47}=\dfrac{24}{47}\)
\(\dfrac{4}{5}x\dfrac{7}{8}=\dfrac{4x7}{5x8}=\dfrac{28}{40}=\dfrac{7}{10}\)
\(\dfrac{8}{5}:\dfrac{1}{4}=\dfrac{8}{5}x\dfrac{4}{1}=\dfrac{32}{5}\)
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\(23+\frac{x}{47-x}=\frac{2}{3}\)
\(\frac{x}{47-x}=\frac{-67}{3}\)\(\Rightarrow\orbr{\begin{cases}x=-67\\47-x=3\Rightarrow x=44\end{cases}}\)
\(23-\frac{x}{47+x}=\frac{1}{3}\)
\(\frac{x}{47+x}=\frac{68}{3}\)\(\Rightarrow\orbr{\begin{cases}x=68\\47+x=3\Rightarrow x=-44\end{cases}}\)
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a. 2 5 + 3 7 + 3 5 + 4 7 = 2 5 + 3 5 + 3 7 + 4 7 = 5 5 + 7 7 = 1 + 1 = 2
b. 2 3 × 4 9 + 2 3 × 5 9 = 2 3 × 4 9 + 5 9 = 2 3 × 9 9 = 2 3 × 1 = 2 3
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0chu mau
= 7000 nha