三偏心蝶阀的安装:(x+y)^2=(x-y)^2+______
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(a+b)^2-(_________)=a^2+b^2
(x+y)^2=(x-y)^2+______
(x+y)^2=(x-y)^2+______
(a+b)^2-2ab=a^2+b^2
(x+y)^2=(x-y)^2+4xy
2ab
4xy
(a+b)^2-2ab=a^2+b^2
(x+y)^2=(x-y)^2+4xy
2ab
4xy