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物理上有平行四邊形定律,即兩個不在同一直線上的合力方向、大小即以這兩個力的大小為邊長,夾角為頂角的四邊形的對角線的方向、長度(大小). 設作用點為點O 當角F1OF3=45時有最大值為22N 當角F1OF3=135時有最小值為2N
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