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Engineering, 04.10.2021 17:50 bandzswagg123
Treo một vật có khối lượng m=40kg vào hai thanh AB và AC ưu góc B=30 độ góc A= 60 độ . tính phản lực của hai thanh AB và AC
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Treo một vật có khối lượng m=40kg vào hai thanh AB và AC ưu góc B=30 độ góc A= 60 độ . tính phản lực...
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