(x^2 +4x+4-y^2)除以(x+y+2)

(x^2 +4x+4-y^2)除以(x+y+2)
(x^2 +4x+4-y^2)除以(x+y+2)

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

(x^2 +4x+4-y^2)/(x+y+2)
=[(x+2)^2-y^2]/(x+y+2)
=(x+y+2)(x+2-y)/(x+y+2)
=x+2-y

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