Решение:
a) \(x^2 - 10x \ge 0\)
\(x(x-10) \ge 0\)
\(x \le 0 \) или \(x \ge 10\)
б) \(x^2 - 12x < 0\)
\(x(x-12) < 0\)
\(0 < x < 12\)
c) \(5x - 10x^2 < 0\)
\(5x(1 - 2x) < 0\)
\(x(1-2x) < 0\)
\(x < 0\) или \(x > 1/2\)
d) \(15x^2 - 60x \le 0\)
\(15x(x - 4) \le 0\)
\(0 \le x \le 4\)
e) \(7x^2 + 14x \le 0\)
\(7x(x+2) \le 0\)
\(-2 \le x \le 0\)
f) \(-3x^2 - 24x < 0\)
\(-3x(x + 8) < 0\)
\(x(x+8) > 0\)
\(x < -8\) или \(x > 0\)
g) \(9x^2 + 54x > 0\)
\(9x(x + 6) > 0\)
\(x < -6\) или \(x > 0\)
h) \(7x^2 + x > 0\)
\(x(7x + 1) > 0\)
\(x < -1/7\) или \(x > 0\)
i) \(x^2 \le 25x\)
\(x^2 - 25x \le 0\)
\(x(x-25) \le 0\)
\(0 \le x \le 25\)
j) \(-4x > x^2\)
\(x^2 + 4x < 0\)
\(x(x + 4) < 0\)
\(-4 < x < 0\)
k) \(80x - 5x^3 > 0\)
\(5x(16 - x^2) > 0\)
\(5x(4 - x)(4 + x) > 0\)
\(x(4-x)(x+4) < 0\)
\(-4 < x < 0\) или \(x > 4\)
l) \(2x^2 - 34x \ge 0\)
\(2x(x - 17) \ge 0\)
\(x \le 0\) или \(x \ge 17\)