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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