F(x)=x⁻⁵
Найти х, при котором f(1/x) < 9x⁸x⁻⁵
(1/x)⁻⁵ < 9x³
(x⁻¹)⁻⁵ < 9x³
x⁵ < 9x³
x⁵-9x³ <0
x³(x²-9)<0
x³(x-3)(x+3)<0
x=0 x=3 x=-3
- + - +
-------- -3 ------ 0 ------- 3 --------
\\\\\\\\ \\\\\\\\\
x∈(-∞; -3)∨(0; 3)
tg3x=3tgx-tg^3x/(1-3tg^2x)
2tgx-tg^3x/(1-3tg^2x)-4sinx=0
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M(x-2)-a(2-x)=m(x-2)+a(x-2)= (x-2)(m+a)
2(7x-3y)-a(7x-3y)=(7x-3y)(2-a)