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下图水准网中,A为已知点,高程为 ,P1~P4为为待定点,观测高差及路线长度为: h1=1.270m, S1=2; h2=-3.380m, S2=2; h3=2.114m, S3=1; h4=1.613m, S4=2; h5=-3.721m, S5=1; h6=2.931m, S6=2; h7=0.782m, S7=2; 若设P2点高程平差值为参数,求:(1)列出条件方程;(2)列出法方程;(3)求出观测值的改正数及平差值;(4)平差后单位差及P2点高程平差值中误差。
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