(x的2次方-y的2次方-6x-6y)/(x+y)

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(x的2次方-y的2次方-6x-6y)/(x+y)
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(x的2次方-y的2次方-6x-6y)/(x+y)
(x的2次方-y的2次方-6x-6y)/(x+y)

(x的2次方-y的2次方-6x-6y)/(x+y)
原式=[(x+y)(x-y)-6(x+y)]/(x+y)
=(x+y)(x-y-6)/(x+y)
=x-y-6

(x的2次方-y的2次方-6x-6y)/(x+y) =
(x^2-y^2-6(x+y))/(x+y)=((x+y)(x-y)-6(x+y))/(x+y)=(x+y)(x-y-6)/(x+y)=x-y-6