Question

tìm X : X : 2/1/2 x X + 2/1/5 = 5/1/2

Answer 1

\(x:2\frac{1}{2}\times x+2\frac{1}{5}=5\frac{1}{2}\)

\(x:\frac{5}{2}\times x+\frac{11}{5}=\frac{11}{2}\)

\(x\times\frac{2}{5}\times x+\frac{11}{5}=\frac{11}{2}\)

\(x\times x\times\frac{2}{5}=\frac{11}{2}-\frac{11}{5}\)

\(x\times x\times\frac{2}{5}=\frac{33}{10}\)

\(x\times x=\frac{33}{10}:\frac{2}{5}\)

\(x\times x=\frac{33}{4}\)

\(\Rightarrow x=\sqrt{\frac{33}{4}}\)

\(x=2,8722...\)

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