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| rev | Admin | (Created page with "'''Solution: C''' <math display = "block"> \begin{array}{l}{{20.000=X\left(a_{\overline{5}|0.11}+1.11^{-5}a_{\overline{5}|0.12}\right)=X(3.69590+3.60478/1.68506)=5.83516\,X}}\\ {{\mathrm{X=20.000}/5.83516=3427.50.}} \end{array} </math> {{soacopyright | 2023 }}") | Nov 18'23 at 23:50 | +264 |