\(\cfrac{3-5x}{x}+\cfrac{3-5y}{y}+\cfrac{3-5z}{z}=0\) হলে \(\cfrac{1}{x}+\cfrac{1}{y}+\cfrac{1}{z}\) এর মান কত ?
Madhyamik 2003
\(\cfrac{3-5x}{x}+\cfrac{3-5y}{y}+\cfrac{3-5z}{z}=0\)
বা, \(\cfrac{3}{x}-\cfrac{5x}{x}+\cfrac{3}{y}-\cfrac{5y}{y}+\cfrac{3}{z}-\cfrac{5z}{z}=0\)
বা, \(\cfrac{3}{x}-5+\cfrac{3}{y}-5+\cfrac{3}{z}-5=0\)
বা, \(\cfrac{3}{x}+\cfrac{3}{y}+\cfrac{3}{z}-15=0\)
বা, \(3\left(\cfrac{1}{x}+\cfrac{1}{y}+\cfrac{1}{z}\right)=15\)
বা, \(\cfrac{1}{x}+\cfrac{1}{y}+\cfrac{1}{z}=5\)