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0,0,1,4,() A、5;B、7;C、9;D、11
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0,1/9,2/27,1/27, ()A.27 B.7/9 C.5/18 D.4/243
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:9,-4,7,4,5,-4,3,4,1,-4,(),()。 A.0,4 B.-1,4 C.-1,-4 D.1.4
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0,0,1,4,() A.7 B.9 C.11 D.13
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9,-4,7,4,5,-4,3,4,1,-4,(),()。 A.0,4 B.-1,4 C.-1,-4 D.1.4
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0,1/9,2/27,1/27, () A.27 B.7/9 C.5/18 D.4/243
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0 1 1 2 3 () 22。A.5 B.7 C.9 D.11