A Markov chain is defined by a transition matrix T = and an initial state matrix S0 = a. For this——青夏教育精英家教网—

摘要：A Markov chain is defined by a transition matrix T = and an initial state matrix S0 = a. For this Markov chain,find S1 . b. For this Markov chain,find S2. c. For this Markov chain, S10 can be found by evaluating A .S5× S5 B. T2 × S8 C. S9 × T D. T9 × S0 E. T10 × S1 d. For this Markov chain, the steady state solution is closest to?

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如图，在△ABC中，DC=2AD，AE=2EB，

=a，

=b，则用a，b表示

为

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如图，在△ABC中，D、E为边AB的两个三等分点，

如图1-2-13,直角梯形ABCD绕底边AD所在直线EF旋转,在旋转前,非直角的腰的端点A可以在DE上选定.当点A选在射线DE上的不同位置时,形成的几何体大小、形状不同,分别画出它的三视图并比较其异同点.

图1-2-13

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A class collects ＄50 to buy flowers for a classmate who is in the hospital. Roses cost ＄3 each， and carnations cost ＄2 each. No other flowers are to be used. How many different bouquets could be purchased for exactly ＄50？_______

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已知正方形ABCD，E、F分别是AB、CD的中点，将△ADE沿DE折起，如图所示，记二面角A-DE-C的大小为θ(0＜θ＜π).

(1)证明BF∥平面ADE；

(2)若△ACD为正三角形，试判断点A在平面BC?DE内的射影G是否在直线EF上，证明你的结论，并求角θ的余弦值.

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