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观察下图,每一个黑色圆周围都要有6个白色圆,照这样的规律画下去,当画完第6个黑色圆时,一共画了 个白色圆;当画完第a个黑色圆时,一共画了 个白色圆.
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如图观察每一个图中黑色正六边形的排列规律则第10个图中黑色正六边形个.
如图是4×4正方形网格其中已有4个小方格涂成了黑色.现在要从其余白色小方格中选出一个也涂成黑色使整个
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观察下图中每一个大三角形中白色的三角形的排列规律则第5个大三角形中白色的三角形有
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某同学在电脑上打下了一串黑白圆如图所示按这种规律往下排那么第 36 个圆的颜色应该是
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如图J66观察每一个图中黑色正六边形的排列规律第10个图中黑色正六边形有________个.
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如图观察每一个图中黑色正六边形的排列规律则第10个图中黑色正六边形有个.
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一半径为R的半球面均匀带有正电荷Q电荷Q在球心O处产生物的场强大小EO=方向如图所示.把半球面分为表面积相等的上下两部分如图甲所示上下两部分电荷在球心O处产生电场的场强大小分别为ElE2把半球面分为表面积相等的左右两部分如图乙所示左右两部分电荷在球心O处产生电场的场强大小分别为E3E4.则
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1772年法籍意大利数学家拉格朗日在论文三体问题指出两个质量相差悬殊的天体如太阳和地球所在同一平面上有5个特殊点如图中的L1L2L3L4L5所示人们称为拉格朗日点.若飞行器位于这些点上会在太阳与地球共同引力作用下可以几乎不消耗燃料而保持与地球同步绕太阳做圆周运动.若发射一颗卫星定位于拉格朗日L2点下列说法正确的是
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