则该力系对z轴的矩为_________ 则该力系对z轴的矩为_________

边长为a的正方体,受力如图所示,则该力系对z轴的矩为_________

边长为a的正方体,受力如图所示,则该力系对z轴的矩为_________


【正确答案】:
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