3) (5x-4)3 + (5x – 2)3 – 250х³ при х = 0,5; 0; -1;

3) (5x-4)³ + (5x – 2)³ – 250x³

(5x-4)³ = 125x³ - 300x² + 240x - 64

(5x – 2)³ = 125x³ - 150x² + 60x - 8

(5x-4)³ + (5x – 2)³ – 250x³ = 125x³ - 300x² + 240x - 64 + 125x³ - 150x² + 60x - 8 - 250x³ = -450x² + 300x - 72

• x = 0,5: -450*0,5² + 300*0,5 - 72 = -450*0,25 + 150 - 72 = -112,5 + 150 - 72 = -34,5
• x = 0: -450*0² + 300*0 - 72 = -72
• x = -1: -450*(-1)² + 300*(-1) - 72 = -450 - 300 - 72 = -822

Ответ: -34,5; -72; -822