Problem 예제.

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그림의 신호 흐름선도에서 $\dfrac{y_2}{y_1}$ 의 값은?

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$\dfrac{a^3}{(1-ab)^3}$

$\dfrac{a^3}{1-3ab+2a^2b^2}$

$\dfrac{a^3}{1-3ab}$

$\dfrac{a^3}{1-3ab+a^2b^2}$