3点x分时
时针角度=(3+x/60)*(360/12)=90+0.5x
分针角度=x/60*360=6x
因为时针和分针成一条直线
所以
90+0.5x=6x或 6x-（90+0.5x）=180
x=16.36 或 x=49.09
在3点过16.36分或49.09分时,时针和分针成一条直线?
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