((x+y)-2(x+y)的2次方-4(x+y))/(x+y)
=((x+y)×1-2(x+y)(x+y)-4(x+y))/(x+y)
＝ (x+y)×(1-2(x+y)-4)/(x+y)
=(x+y)×(-2x-2y-3)/(x+y)
=-2x-2y-3
((x+y)-2(x+y)的2次方-4(x+y))/(x+y)
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