25(X-Y)^2+10(x-y)+1?
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25(X-Y)^2+10(x-y)+1?25(X-Y)^2+10(x-y)+1?25(X-Y)^2+10(x-y)+1?25(X-Y)^2+10(x-y)+1=[5(X-Y)]²+10(x-
25(X-Y)^2+10(x-y)+1?
25(X-Y)^2+10(x-y)+1?
25(X-Y)^2+10(x-y)+1?
25(X-Y)^2+10(x-y)+1
=[5(X-Y)]²+10(x-y)+1
=（5x-5Y+1）²
25(X-Y)²+10(x-y)+1
=[5（x-y）]²+10(x-y)+1²
=(5x-5y+1)²