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

X^(lg^2 x-3lgx+1)>1000 lgX^(lg^2 x-3lgx+1)>lg1000 (lg^2 x-3lgx+1)lgx>3 lg^3 x-3lg^2x+lgx-3>0 lg^2x(lgx-3)+(lgx-3)>0 (lgx-3)(lg^2x+1)>0 lg^2x+1>0  всегда lgx-3>0 lgx>3 x>1000 2) 5^logx49-7^logx5-2>=0 49^logx5-7^logx5-2>=0 7^2logx5-7^logx5-2>=0 7^logx5=t, t>0 t^2-t-2>=0 (t+1)(t-2)>=0, t>0 t>=2  7^logx5>=2 logx5>=log7(2) x^log7(2)>=5 x>=5^log2(7)