Y`=-9/x²+1=(-9+x²)/x²=0
x²=9
x=-3 U x=3
+ _ +
--------------(-3)-------------------(3)-----------------------
min
ymin=y(3)=3+3+11=17
Решение во вложении---------------------------------
13x+17-(18x+14)+5x-2=
=13x+17-18x-14+5x-2=
=18x+17-18x-16=
=1
xₙ = 3 + 2n²
x₁ = 3 + 2 * 1² = 3 + 2 = 5
x₂ = 3 + 2 * 2² = 3 + 2 * 4 = 3 + 8 = 11
x₃ = 3 + 2 * 3² = 3 + 2 * 9 = 3 + 18 = 21
x₄ = 3 + 2 * 4² = 3 + 2 * 16 = 3 + 32 = 35
(b+c)(b-c)-b(b-2c)= 2b-cb+cb-2c-2b+2bc= -2c+2bc.
Ответ: -2c+2bc.