Toán Lớp 7: ($\frac{-47}{81}$ × $\frac{3}{997}$) ÷ $\frac{8}{997}$ + ( $\frac{-34}{81}$ + $\frac{3}{997}$ ) ÷ $\frac{8}{997}$
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Toán Lớp 7: ($\frac{-47}{81}$ × $\frac{3}{997}$) ÷ $\frac{8}{997}$ + ( $\frac{-34}{81}$ + $\frac{3}{997}$ ) ÷ $\frac{8}{997}$
Comments ( 2 )
\left( {\dfrac{{ – 47}}{{81}} – \dfrac{3}{{997}}} \right):\dfrac{8}{{997}} + \left( {\dfrac{{ – 34}}{{81}} + \dfrac{3}{{997}}} \right):\dfrac{8}{{997}}\\
= \left( {\dfrac{{ – 47}}{{81}} – \dfrac{3}{{997}} + \dfrac{{ – 34}}{{81}} + \dfrac{3}{{997}}} \right):\dfrac{8}{{997}}\\
= \left( {\dfrac{{ – 47}}{{81}} + \dfrac{{ – 34}}{{81}}} \right):\dfrac{8}{{997}}\\
= \dfrac{{ – 47 – 34}}{{81}}:\dfrac{8}{{997}}\\
= \dfrac{{ – 81}}{{81}} \times \dfrac{{997}}{8}\\
= – 1 \times \dfrac{{997}}{8}\\
= – \dfrac{{997}}{8}
\end{array}\]