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【简答题】
求下列微分方程的幂级数解：y"=xy
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【单选题】In your essay on the influence of TV, don’t forget to discuss these.( )
A.
a brief chat
B.
bright colours
C.
key issues
D.
a major problem
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A.
a brief chat
B.
a major problem
C.
key issues
D.
bright colors
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