Помогите срочно!!!
1) log√7 49
2) log3(x^2+x-1)=log3 (-x+7)
3) log1/3 (-3-6)≤ log1/3 (6-x^2)
4) log2 (x^2-6x+24)<4
5) log5x-log5 35≤ log5 1/7