Помогите. 1) X^(lg^2 x-3lgx+1)amp;gt;1000. 2) 5^logx49-7^logx5-2amp;gt;=0

X^(lg^2 x-3lgx+1)gt;1000
lgX^(lg^2 x-3lgx+1)gt;lg1000
(lg^2 x-3lgx+1)lgxgt;3
lg^3 x-3lg^2x+lgx-3gt;0
lg^2x(lgx-3)+(lgx-3)gt;0
(lgx-3)(lg^2x+1)gt;0
lg^2x+1gt;0  всегда
lgx-3gt;0
lgxgt;3
xgt;1000
2) 5^logx49-7^logx5-2gt;=0
49^logx5-7^logx5-2gt;=0
7^2logx5-7^logx5-2gt;=0
7^logx5=t, tgt;0
t^2-t-2gt;=0
(t+1)(t-2)gt;=0, tgt;0
tgt;=2
 7^logx5gt;=2
logx5gt;=log7(2)
x^log7(2)gt;=5
xgt;=5^log2(7)