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120

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120

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2^{3} \times 3 \times 5

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30 + 30 + 60 =

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You made a mistake in solving

x (1 + x) = A (1 - x)^{3} + B (1 - x)^{2} + C (1 - x) + D

A faster way to solve this is the following:

x = 1 \Rightarrow D = 2

1 + 2 x = - 3 A (1 - x)^{2} - 2 B (1 - x) - C

x = 1

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60+60

Adunați 30 și 30 pentru a obține 60.

120

Adunați 60 și 60 pentru a obține 120.

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