Решите.

[tex] 1)5^{X} * 2^{1-X}+ 5^{X+1}* 2^{-X}\ \textgreater \ 7 *0.4^{1/X}


2) 4^{X+1}-13*6^{X}+ 9^{X+1} \geq 0 [/tex]
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