Răspuns:
[tex]( {9}^{2} - {2}^{4} \times {5}^{9} \div {( {5}^{4}) }^{2} ) \div {2}^{2 } = \\ (81 - {2}^{4} \times {5}^{9} \div {5}^{8} ) \div {2}^{2} = \\ (81 - 16 \times {5}^{1} ) \div 4 = \\ (81 - 16 \times 5) \div 4 = \\ (81 - 80) \div 4 = \\ 1 \div 4 = \frac{1}{4} = 0.25[/tex]
