Problem 예제.

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다음 연산 증폭기의 출력 $X_3$ 는?

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$-a_1X_1-a_2X_2$

$a_1X_1+a_2X_2$

$(a_1+a_2)(X_1+X_2))$

$-(a_1-a_2)(X_1+X_2))$