1
-x+8>0,2+1
0,2x+x<8-1<br>1,2x<7<br>x<5 5/6<br>x∈(-∞;5 5/6)
2
(x-9)(x+9)/(x+4)>0
x=9 x=-9 x=-4
_ + _ +
---------------(-9)-----------------(-4)-------------------(4)----------------
x∈(-9;-4) U (9;∞)
3
x(x-15)>0
x=0 x=15
+ _ +
-------------(0)--------------------(15)--------------
x∈(-∞;0) U (15;∞)
4
(x-8)(x+8)>0
x=8 x=-8
+ _ +
-----------------(-8)------------------(8)-----------------------
x∈(-∞;-8) U (8;∞)