1
x-(8x-2)/(x+5)≤0
(x²+5x-8x+2)/(x+5)≤0
(x²-3x+2)/(x+5)≤0
x²-3x+2=0
x1+x2=3 U x1*x2=2⇒x1=1 U x2=2
x+5=0⇒x=-5
_ + _ +
---------------(-5)-----------[1]-----------[2]------------------
x∈(-∞;-5) U [1;2]
2
(x²-4x)²-16≤0
(x²-4x+4)(x²-4x-4)≤0
(x-2)²(x²-4x-4)≤0
x-2=0⇒x=2
x²-4x-4=0
D=16+16=32
x1=(4-4√2)/2=2-2√2 U x2=2+2√2
+ _ _ +
------------[2-2√2]---------[2]---------------[2+2√2]------------
x∈[2-2√2;2+2√2]