打字猴:1.70099302e+09
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
1700993050 5-12 
1700993051
1700993052 5-13 4mR2.
1700993053
1700993054
1700993055 5-14 
1700993056
1700993057 5-15 IC+4ml2或IC+ml2.
1700993058
1700993059
1700993060 5-16 
1700993061
1700993062
1700993063 5-17 
1700993064
1700993065
1700993066 5-18 β1=2M/(m1+m2),β2=2M/(m1+m2)R1R2.
1700993067
1700993068
1700993069 5-19 N1,N2都指向环心,
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