k?11k?1?????2p0v0??pcr?k?2p0?p0?k??pcr?k??所以 1=?1?????k?1p??p???1???p??? k?1pcrvcr??pcr?cr??0????0??????2?p?k?1kk?1k?1????k??p???2??p?kk?1??0??p?1??cr?cr??????p0??k?1??p0?k??k?1k?p?cr??2?1??12???k?1??0??1?=1 ?????pcr????k?1? pcr???2?kpcr???0?k?1?
k?11k?1?????2p0v0??pcr?k?2p0?p0?k??pcr?k??所以 1=?1?????k?1p??p???1???p??? k?1pcrvcr??pcr?cr??0????0??????2?p?k?1kk?1k?1????k??p???2??p?kk?1??0??p?1??cr?cr??????p0??k?1??p0?k??k?1k?p?cr??2?1??12???k?1??0??1?=1 ?????pcr????k?1? pcr???2?kpcr???0?k?1?