👤

[tex]a) {2}^{x} \div ( {2}^{x + 1} - {2}^{x}) \\ b)4 \div ( { 3}^{x + 1} + {3}^{x}) \\ c)( {5}^{x + 2} - {5}^{x + 1} + {5}^{x} ) \div 21 \\ [/tex]
10 puncte​