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平行四邊形法則求兩個互成角度的共點力的合力,可以用表示這兩個力的線段為鄰邊作平行四邊形,這兩個鄰邊之間的對角線就表示合力的大小和方向,這種方法就叫做“力的平行四邊形法則”.我們知道加、减、乘、除的算術運算…
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