47 lines
880 B
Plaintext
47 lines
880 B
Plaintext
ans
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000293
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(1) $(\dfrac 73,\dfrac 76,\dfrac 76)$, $(0,0,0)$, $(\dfrac 72,0,\dfrac 72)$; (2) $\dfrac{5\sqrt{3}}3$
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000304
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(1) 证明略; (2) $1$; (3) $(\dfrac 13,1)$
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010721
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(1) 证明略; (2) $\dfrac{\sqrt{51}}{17}$; (3) $\dfrac{\sqrt{41}}8$
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000294
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(1) 证明略; (2) $\arcsin \dfrac{\sqrt{10}}5$
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030462
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(1) 证明略; (2) $\dfrac{\sqrt{2}}3$
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000305
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(1) 证明略; (2) $\dfrac\pi 3$与$\dfrac{2\pi}3$
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000299
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(1) 证明略; (2) $\arccos \dfrac 23$
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004096
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(1) $\arcsin \dfrac{\sqrt{15}}5$; (2) $\arccos \dfrac{\sqrt{10}}5$
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010730
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$\arccos \dfrac{3\sqrt{10}}{10}$
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004348
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(1) $\arccos\dfrac{\sqrt{10}}{10}$; (2) $\dfrac{2\sqrt{33}}{11}$
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004698
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(1) 证明略; (2) $\arcsin \dfrac{4\sqrt{5}}{25}$
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030472
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(1) 证明略; (2) $\dfrac{\sqrt{15}}{5}$; (3) 存在, $\dfrac{PM}{PC}=\dfrac 13$
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004243
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(1) $\dfrac{\sqrt{21}}7$; (2) $\sqrt{2}$
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000296
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(1) 证明略; (2) $2$
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030468
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B
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