P122第3题—(1)、(2)、(3) 1)x=4017m)y=2046Mx=4134mny=211 (2)D10=1387a1B=290317 1(3)m=19402=2014m Dc=37cm×2000=74m, D ×100%=8.1 ACP122第3题— (1)、（2）、（3） ◼ (1) ◼ (2) ◼ (3) xA = 4017m, yA = 2046m; xB = 4134m, yB = 2111m =133.8 , = 29 0317  DAB m  AB 100% 8.1% 3.7 2000 74 , 195.4 , 201.4 , =  = =  = = = AC AC AC AC A C D h i D cm m H m H m