(x^2 +4x+4-y^2)除以(x+y+2)
=[(x+2)²-y²]÷(x+y+2)
=(x+2+y)(x+2-y)÷(x+y+2)
=x+2-y
(x^2 +4x+4-y^2)除以(x+y+2)
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