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第一道題什麼亂七八糟的,看不懂,也許是(1)a,b (2)-a,b (3)a,-b (4)-a,-b 2,有四種情况 a,m=2,n=3 b,m=-2,n=3 c,m=2,n=-3 d,m=-2,m=-3 第三題,第一列相加-6-11-4=-21 對角線上,-6-7+x=-21 x=8
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