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【简答题】
已知矩阵A= ，其中a∈R，若点P（1，1）在矩阵A的变换下得到点P′（0，-3）.（1）求实数a的值； （2）求矩阵A的特征值及特征向量.
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A.
first came from their passionate dream of human flying
B.
finally led to their accomplishment.
C.
was the result of relentless pursui
D.
was born from their desire to be investors
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【单选题】One reason that the Wright brothers’ interest moved to flying was that_____.
A.
making airplanes would bring them more money
B.
flying was more exciting
C.
the bicycle company was closed down
D.
selling and repairing bicycles was not their hobby
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