Rozwiąż nierówność * (-2x) \geq 0
czyli:
x^4 * (-2x) ≥ 0
-2x^5 ≥ 0 /:(-2)
x^5 ≤ 0
x ≤ 0
x∈ (-∞ , 0>
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czyli:
x^4 * (-2x) ≥ 0
-2x^5 ≥ 0 /:(-2)
x^5 ≤ 0
x ≤ 0
x∈ (-∞ , 0>