1
(8x³-20x²-20x²+50x-8x³+42x²-75x+51)/(2x-5)≤0
(2x²-25x+51)/(2x-5)≤0
2x²-25x+51=0
D=625-408=217
x1=(25-√217)/4 U x2=(25+√217)/4
2x-5=0⇒x=2,5
_ + _ +
--------------(25-√217)/4------------(2,5)---------------(25+√217)/4----------
x∈(-∞;(25-√217)/4] U (2,5;(25+√217)/4]
b
2x(x-1)-2√7(x-1)≤0
(x-1)(2x-2√7)≤0
x=1 x=√7
x∈[1;√7]