889
8x²-2x-1<0<br>D=4+32=36
x1=(2-6)/16=-1/4
U x2=(2+6)/16=1/2
+ _ +
----------------(-1/4)---------------(1/2)----------------
x∈(-1/4;1/2)
5x²+7x≤0
x(5x+7)≤0
x=0 x=-1,2
+ _ +
----------------[-1,2]---------------[0]---------------
x∈[-1,2;0]
890
(x-3)(x+3)/(x-2)(x+2)<0<br>x=3 x=-3 x=2 x=-2
+ _ + _ +
----------------(-3)---------------(-2)------------(2)---------------------(3)----------------
x∈(-3;-2) U (2;3)
(2x²+3)(x+4)²>0
2x²+3>0 при любом х
(x+4)²> при любом х,кроме х=0
х∈(-∞;0) U (0;∞)