Tìm \(x\) trong biểu thức \(16:\left( {\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9} \right) =
Tìm \(x\) trong biểu thức \(16:\left( {\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9} \right) = \dfrac{7}{{10}}\)
Đáp án đúng là: A
\(16:\left( {\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9} \right) = \dfrac{7}{{10}}\)
\(\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9 = 16:\dfrac{7}{{10}}\)
\(\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9 = \dfrac{{160}}{7}\)
\(\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} + 9 = \dfrac{{160}}{7}\)
\(\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} = \dfrac{{160}}{7} - 9\)
\(\dfrac{{\dfrac{3}{5} \times x + 8}}{{21}} = \dfrac{{97}}{7}\)
\(\dfrac{3}{5} \times x + 8 = \dfrac{{97}}{7} \times 21\)
\(\dfrac{3}{5} \times x + 8 = 291\)
\(\dfrac{3}{5} \times x = 291 - 8\)
\(\dfrac{3}{5} \times x = 283\)
\(x = 283:\dfrac{3}{5}\)
\(x = \dfrac{{1415}}{3}\)
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