Let a,b and c be ration numbers and b=12/5-13/5a,c=13/5-12/5a.then a2-b2+c2=?
问题描述:
Let a,b and c be ration numbers and b=12/5-13/5a,c=13/5-12/5a.then a2-b2+c2=?
答
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