42. 2m/(m - 1)³ + (1 + m²)/(1 - m)³ = - 2m/(1 - m)³ + (1 + m²)/(1 - m)³ =
= (-2m + 1 + m²)/(1 - m)³ = (1 - m)²/(1 - m)³ = 1/(1 - m)
при m = 0,75 1/(1 - m) = 1 : (1 - 0.75) = 1 : 0.25 = 4
45. (3√x / (3 - √x) + 3) · (9 - 6√x + x) =
(3√x + 9 - 3√x)/(3 - √x) · (3 - √x)² = 9· (3 - √x)
при х = 169 9(3 - √х) = 9(3 - √169) = 9 · (-10) = -90
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42. 2m/(m - 1)³ + (1 + m²)/(1 - m)³ = - 2m/(1 - m)³ + (1 + m²)/(1 - m)³ =
= (-2m + 1 + m²)/(1 - m)³ = (1 - m)²/(1 - m)³ = 1/(1 - m)
при m = 0,75 1/(1 - m) = 1 : (1 - 0.75) = 1 : 0.25 = 4
45. (3√x / (3 - √x) + 3) · (9 - 6√x + x) =
(3√x + 9 - 3√x)/(3 - √x) · (3 - √x)² = 9· (3 - √x)
при х = 169 9(3 - √х) = 9(3 - √169) = 9 · (-10) = -90