Tìm \(x\):a) \(x \times \dfrac{1}{2} - \dfrac{4}{3} = \dfrac{1}{3}\)b) \(\dfrac{{75}}{{20 - x}} = \dfrac{3}{2} \times
Tìm \(x\):
a) \(x \times \dfrac{1}{2} - \dfrac{4}{3} = \dfrac{1}{3}\)
b) \(\dfrac{{75}}{{20 - x}} = \dfrac{3}{2} \times 10\)
c) \(\dfrac{{10}}{3} \times \dfrac{1}{2} - \left( {\dfrac{1}{2} \times x - \dfrac{1}{3}} \right) + \dfrac{1}{5} = \dfrac{3}{5}:\dfrac{1}{2}\)
a) \(x \times \dfrac{1}{2} - \dfrac{4}{3} = \dfrac{1}{3}\)
\(x \times \dfrac{1}{2} = \dfrac{1}{3} + \dfrac{4}{3}\)
\(x \times \dfrac{1}{2} = \dfrac{5}{3}\)
\(x = \dfrac{5}{3}:\dfrac{1}{2}{\rm{ }}\)
\(x = \dfrac{{10}}{3}\)
b) \(\dfrac{{75}}{{20 - x}} = \dfrac{3}{2} \times 10\)
\(\dfrac{{75}}{{20 - x}} = 15\)
\(\dfrac{{75}}{{15}} = 20 - x{\rm{ }}\)
\(5 = 20 - x\)
\(x = 20 - 5\)
\(x = 15\)
c) \(\dfrac{{10}}{3} \times \dfrac{1}{2} - \left( {\dfrac{1}{2} \times x - \dfrac{1}{3}} \right) + \dfrac{1}{5} = \dfrac{3}{5}:\dfrac{1}{2}\)
\(\dfrac{5}{3} - \left( {\dfrac{1}{2} \times x - \dfrac{1}{3}} \right) + \dfrac{1}{5} = \dfrac{6}{5}{\rm{ }}\)
\(\dfrac{5}{3} - \dfrac{1}{2} \times x + \dfrac{1}{3} = \dfrac{6}{5} - \dfrac{1}{5}\)
\(\dfrac{5}{3} + \dfrac{1}{3} - \dfrac{1}{2} \times x = 1{\rm{ }}\)
\(2 - \dfrac{1}{2} \times x = 1\)
\(2 - 1 = \dfrac{1}{2} \times x\)
\(1 = \dfrac{1}{2} \times x\)
\(1 \times 2 = x\)
\(x = 2\)
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