4^{40} * 5^{40} \\ \\ 28^{40} > 2^{80} * 5^{40} " alt=" 28^{40} = (7*4)^{40} = 7^{40} * 4^{40} \\ \\ 2^{80}* 5^{40} = (2^{2} )^{40} * 5^{40} = 4^{40} * 5^{40} \\ \\ 4^{40} * 7^{40} > 4^{40} * 5^{40} \\ \\ 28^{40} > 2^{80} * 5^{40} " align="absmiddle" class="latex-formula">