如图所示,物体a,b和c叠放在水平桌面上,水平力Fb=5N,Fc=8N,分别作于物体b,c上,a,b如图所示,物体a,b和c叠放在水平桌面上,水平力Fb=5N,Fc=8N,分别作于物体b,c上,a,b和c仍能保持静止 以f1,f2,f3分别表示a与
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![如图所示,物体a,b和c叠放在水平桌面上,水平力Fb=5N,Fc=8N,分别作于物体b,c上,a,b如图所示,物体a,b和c叠放在水平桌面上,水平力Fb=5N,Fc=8N,分别作于物体b,c上,a,b和c仍能保持静止 以f1,f2,f3分别表示a与](/uploads/image/z/2015610-42-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%89%A9%E4%BD%93a%2Cb%E5%92%8Cc%E5%8F%A0%E6%94%BE%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%B8%8A%2C%E6%B0%B4%E5%B9%B3%E5%8A%9BFb%3D5N%2CFc%3D8N%2C%E5%88%86%E5%88%AB%E4%BD%9C%E4%BA%8E%E7%89%A9%E4%BD%93b%2Cc%E4%B8%8A%2Ca%2Cb%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%89%A9%E4%BD%93a%2Cb%E5%92%8Cc%E5%8F%A0%E6%94%BE%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%B8%8A%2C%E6%B0%B4%E5%B9%B3%E5%8A%9BFb%3D5N%2CFc%3D8N%2C%E5%88%86%E5%88%AB%E4%BD%9C%E4%BA%8E%E7%89%A9%E4%BD%93b%2Cc%E4%B8%8A%2Ca%2Cb%E5%92%8Cc%E4%BB%8D%E8%83%BD%E4%BF%9D%E6%8C%81%E9%9D%99%E6%AD%A2+%E4%BB%A5f1%2Cf2%2Cf3%E5%88%86%E5%88%AB%E8%A1%A8%E7%A4%BAa%E4%B8%8E)
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