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根據平行四邊形定則,已知一個分力沿水平方向,做出平行四邊形如圖所示,由圖形可知另一個分力F2的大小為:F2=F2+F21=1802+2402 N=300N.方向如圖所示;答:另一個分力的大小300N,方向如圖所示.
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