打字猴:1.700993e+09
1700993000 4-25 
1700993001
1700993002 4-26 略.
1700993003
1700993004
1700993005 4-27 (1)(2)0.
1700993006
1700993007 4-28 不守恒,其他略.
1700993008
1700993009 4-29 上方顶角为19.8°,侧方顶角为189.3°,下方顶角为70.8°:不能.
1700993010
1700993011 4-30 略. 4-31 0.048或0.153.
1700993012
1700993013 4-32 (1)需燃料28.7kg; (2)需燃料117kg.
1700993014
1700993015
1700993016 4-33 
1700993017
1700993018 第 五 章
1700993019
1700993020
1700993021 5-1 (1)6aλ; (2)
1700993022
1700993023 5-2 各边中点构成的小三角形内心.
1700993024
1700993025 5-3 (M+3m)g.
1700993026
1700993027 5-4 不能.
1700993028
1700993029
1700993030 5-5 aC0=kl/(m1+m2),
1700993031
1700993032
1700993033 5-6 (1)略; (2)
1700993034
1700993035
1700993036 5-7 
1700993037
1700993038 5-8 略.
1700993039
1700993040
1700993041 5-9 
1700993042
1700993043
1700993044 5-10 
1700993045
1700993046
1700993047 5-11 
1700993048
1700993049
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