www.5129.net > x+y=7和3(1+1o%)x+2(l%5%)y=l7.5解方程

x+y=7和3(1+1o%)x+2(l%5%)y=l7.5解方程

详细步骤写在纸上了,行家正解

解:(1)小球在B点处于静止状态,对小球进行受力分析,根据平衡条件得: mgtanθ=

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