65 lines
813 B
Plaintext
65 lines
813 B
Plaintext
ans
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018216
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$(1,0)$
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018217
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$\dfrac{1}{6}$
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018218
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$4\pi$
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018219
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$45^\circ$
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018220
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$y=\sqrt{2} x$和$y=-\sqrt{2}x$
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018221
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$(x-1)^2+(y-1)^2=5$
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018222
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$0.10$
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018223
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假
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018224
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$\dfrac{\pi}{3}$
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018225
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\textcircled{1}\textcircled{2}\textcircled{4}
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018226
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$\dfrac{\pi}{4}$或$\arccos\dfrac{3\sqrt{34}}{34}$
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018227
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$4900$
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018228
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C
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018229
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D
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018230
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A
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018231
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B
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018232
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(1) $-2$; (2) $11$
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018233
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(1) $\dfrac{2\sqrt{5}}{5}$; (2) $4x-3y-3=0$或$y+1=0$
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018234
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(1) $x=0.005$, $y=0.045$, 中位数为$26.5$(分), 众数为$25$(分), 极差为$36$(分); (2) 估计中位数为$26$分, 平均数为$29.1$分, 方差为$82.39$
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018235
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(1) 证明略; (2) $\dfrac{5\sqrt{21}}{21}$; (3) $MC=-1+\sqrt{5}$;
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018236
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(1) $\dfrac{\sqrt{2}}{2}$; (2) 过定点$P(-1+\sqrt{2},-\dfrac{\sqrt{2}}2-1)$; (3) 直线$PQ$与圆相切
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