39) 86³n³ - 12b²n³ + 4b³n² = 462n2....

39) 8b³n³ - 12b²n³ + 4b³n² = 4b²n²

8b³n³ - 12b²n³ + 4b³n² - 4b²n² = 0

8b³n³ - 12b²n³ + 4b³n² - 4b²n² = 0

4b²n²(2bn - 3n + b - 1) = 0

4b²n² = 0 или 2bn - 3n + b - 1 = 0

Если 4b²n² = 0, то b = 0 или n = 0

2bn - 3n + b - 1 = 0

n(2b - 3) = 1 - b

n = $$\\frac{1 - b}{2b - 3}$$, при b ≠ 3/2

Ответ: b = 0 или n = 0, или n = $$\frac{1 - b}{2b - 3}$$, при b ≠ 3/2