高中一道个、关于力的分解的题如图所示:三个共点力,F1=5N,F2=10N,F3=15N,a=60°,求三个力的合力,这个人是怎么根据F4 F2求出合理为10根号3的,还有怎么确定的与x轴夹角为30度
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![高中一道个、关于力的分解的题如图所示:三个共点力,F1=5N,F2=10N,F3=15N,a=60°,求三个力的合力,这个人是怎么根据F4 F2求出合理为10根号3的,还有怎么确定的与x轴夹角为30度](/uploads/image/z/8573038-70-8.jpg?t=%E9%AB%98%E4%B8%AD%E4%B8%80%E9%81%93%E4%B8%AA%E3%80%81%E5%85%B3%E4%BA%8E%E5%8A%9B%E7%9A%84%E5%88%86%E8%A7%A3%E7%9A%84%E9%A2%98%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%3A%E4%B8%89%E4%B8%AA%E5%85%B1%E7%82%B9%E5%8A%9B%2CF1%3D5N%2CF2%3D10N%2CF3%3D15N%2Ca%3D60%C2%B0%2C%E6%B1%82%E4%B8%89%E4%B8%AA%E5%8A%9B%E7%9A%84%E5%90%88%E5%8A%9B%2C%E8%BF%99%E4%B8%AA%E4%BA%BA%E6%98%AF%E6%80%8E%E4%B9%88%E6%A0%B9%E6%8D%AEF4+F2%E6%B1%82%E5%87%BA%E5%90%88%E7%90%86%E4%B8%BA10%E6%A0%B9%E5%8F%B73%E7%9A%84%2C%E8%BF%98%E6%9C%89%E6%80%8E%E4%B9%88%E7%A1%AE%E5%AE%9A%E7%9A%84%E4%B8%8Ex%E8%BD%B4%E5%A4%B9%E8%A7%92%E4%B8%BA30%E5%BA%A6)
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