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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: ($\frac{1}{3}$ . $\frac{10}{13}$ – $\frac{10}{13}$ . $\frac{11}{13}$) : 10 giúp với

Toán Lớp 7: ($\frac{1}{3}$ . $\frac{10}{13}$ – $\frac{10}{13}$ . $\frac{11}{13}$) : 10
giúp với

Comments ( 2 )

  1.           ( $\frac{1}{3}$ . $\frac{10}{13}$ – $\frac{10}{13}$ . $\frac{11}{3}$ ) : 10
    = [ $\frac{10}{13}$ . ( $\frac{1}{3}$ – $\frac{11}{13}$ )] : 10
    = [ $\frac{10}{13}$ . $\frac{-20}{39}$ ] : 10
    = $\frac{-200}{507}$ : 10
    = $\frac{-200}{507}$ . $\frac{1}{10}$ 
    = $\frac{-20}{507}$.

  2. ($\frac{1}{3}$ · $\frac{10}{13}$ – $\frac{10}{13}$ · $\frac{11}{13}$) : 10
    = $\frac{10}{13}$ · ($\frac{1}{3}$ – $\frac{11}{13}$) : 10
    = $\frac{1}{13}$ · $\frac{-20}{39}$
    = $\frac{-20}{507}$

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222-9+11+12:2*14+14 = ? ( )

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