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p*a*sin35°=F(a b) ，求出p，p3=psin35°，p2=pcos35°
p1的方向错了，p1=F*b/a
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p*a*sin35°=F(a b) ，求出p，p3=psin35°，p2=pcos35°
p1的方向错了，p1=F*b/a