(49-x²)/(5-x)<0 ОДЗ: 5-x≠0 => x≠5
(49-x²)/(5-x)=0
(7+x)(7-x)/(5-x)=0
(7+x)(7-x)=0
7+x=0 => x=-7, или
7-x=0 => x=7
x₁=7
x₂=-7
- -7 + 5 - 7 +
------°------------°-----°--------
x∈(-∞;-7)∪(5;7)
У^2-2у^2-у2(у+3)(у-3)+2у(2у^2+5)=
=-у^2-у^2(у^2-9)+4у^3+10у=
=4у^3-у^2-у^4+9у^2+10у=
=4у^3-у^4+8у^2+10у
X^2 - x + 8x - 8 = x^2 + 7x - 8
A1= 5
a2=2/5
a3= 2 * 5/2 = 5
a4=2/5
a5=5
a6=2/5