[tex] {( {4}^{2} \div {2}^{2} ) }^{2} \times {4}^{18} \div {256}^{2} = \\ {( {2}^{2} )}^{2} \times {4}^{18} \div {( {4}^{4} )}^{2} = \\ {4}^{2} \times {4}^{18} \div {4}^{4 \times 2} = \\ {4}^{20} \div {4}^{8} = \\ = {4}^{12} [/tex]
