thank you very much

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thank you very much
thank you very much

thank you very much
因为cd垂直ab 所以角1加角a等于90° 因为de垂直bc 所以角2加角b等于90° 因为角1加角2等于90度°所以角a加角b等于90度所以角c等于90° 所以ac垂直bc

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