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可以利用力的合成來做,三個力再同一方向,使其力最大4+5+10=19,兩力相反,則最小,10-4-5=1,兩者都是在同一方向,多力最大一定是若干力之和,但是最小力則需要考慮是否滿足平衡原則,三角形力的合成,很有可能,它的最小力,會是0,需要仔細考慮了
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