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得……(2)

当时,……….(1)

所以,当时, ……………………………7

因为=

= ……………………………………6

(2)

所以, ……………………………………4

则,即．………………………3分

又因为

0 9696 9704 9710 9714 9720 9722 9726 9732 9734 9740 9746 9750 9752 9756 9762 9764 9770 9774 9776 9780 9782 9786 9788 9790 9791 9792 9794 9795 9796 9798 9800 9804 9806 9810 9812 9816 9822 9824 9830 9834 9836 9840 9846 9852 9854 9860 9864 9866 9872 9876 9882 9890 447090