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8-50 (1)略;
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(2)参考答案:R=1.104×108m,M=5.11×1030kg;
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附 录
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附-1 Ln=n!.
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附-2 x=2,y=1,z=-3.
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附-3 (1)A+B:(3,-2,-9),A-B:(5,-6,3),证明略;(2)证明略.
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附-4 证明略.
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附-5 证明略.
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附-6 提示:若A·(B×C)=0,则A,B,C共面.
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附-7 证明略.
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附-8
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附-9 x0=-1是极小值点,函数曲线图略.
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附-10
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附-11 v=v0i+(2t/A)j,a=(2/A)j. 附-12 证明略.
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附-13 (1)证明略;
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(2)
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附-14
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附-15
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附-16
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