(x+y)²+10(x+y)+25

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(x+y)²+10(x+y)+25
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(x+y)²+10(x+y)+25
(x+y)²+10(x+y)+25

(x+y)²+10(x+y)+25
(x+y)²+10(x+y)+25
=(x+y+5)²

原式=(x+y)²+2*5*(x+y)+5²
=(x+y+5)²