Toán Lớp 7: tính : 15/2+(7/3+7/2) : (-23/6+22/7)
{ko phk thi }
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Toán Lớp 7: tính : 15/2+(7/3+7/2) : (-23/6+22/7)
{ko phk thi }
Comments ( 2 )
#andy
\[\begin{array}{l}
\dfrac{{15}}{2} + \left( {\dfrac{7}{3} + \dfrac{7}{2}} \right):\left( { – \dfrac{{23}}{6} + \dfrac{{22}}{7}} \right)\\
= \dfrac{{15}}{2} + \dfrac{{35}}{6}:\left( { – \dfrac{{29}}{{42}}} \right)\\
= \dfrac{{15}}{2} + \left( { – \dfrac{{245}}{{29}}} \right)\\
= – \dfrac{{55}}{{58}}
\end{array}\]
Giải đáp:
$\dfrac{-55}{58}$.
Lời giải và giải thích chi tiết:
$\dfrac{15}2+\left(\dfrac73+\dfrac72\right):\left(\dfrac{-23}6+\dfrac{22}7\right)\\=\dfrac{15}2+\dfrac{35}6:\dfrac{-29}{42}\\=\dfrac{15}2+\dfrac{245}{42}:\dfrac{-29}{42}\\=\dfrac{15}2+\dfrac{-245}{29}\\=\dfrac{-55}{58}$