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求解！！！！

8. 如圖所示,當鐵環保持靜止不動時,若以F1、F2、F3各表示三個彈簧秤讀數,則 F1、F2、 F3的關係為何? F3 F₁ F2 (A)Fz+F3=F1 (B)F1+F2=F3 (C)Fi=F2=F3 (D)F1+F3=F2。

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濡熙
濡熙

F3=F1因為靜止不動 所以兩邊的力會是一樣（合力為零

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