case1 令b,c,d=0,則a=0 =>a=b=c=d=0
case2 令b,c,d存在非零之數,則 a+b√2+c√3+d√6屬於Q' (Q+Q'屬於Q') a+b√2+c√3+d√6=0 不成立 (Q'不等於Q) _________________ Atra esternī ono thelduin Mor'ranr līfa unin hjarta onr Un du evarīnya ono varda. May good fortune rule over you Peace live in your heart And the stars watch over you.
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