若a,b,c,d为整数,(a2+b2)(c2+d2)=1993,则a2+b2+c 发布时间:2017-03-31 18:31 │ 来源:www.tikuol.com 题型:填空题 问题: 若a,b,c,d为整数,(a2+b2)(c2+d2)=1993,则a2+b2+c2+d2=______.
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