25(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+1

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25(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+125(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+125(x-y)*2+10(y-x)+125(x-

25(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+1
25(x-y)*2+10(y-x)+1
25(x-y)^2+10(y-x)+1

25(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+1
一个完全平方公式 等于(5y-5x+1)^2

=50x-50y+10y-10x+1
=40x-40y+1