x2+x+y2/x+y

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x2+x+y2/x+y
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x2+x+y2/x+y
x2+x+y2/x+y

x2+x+y2/x+y
x2是x^2?
y2是y^2?
原来的式子是(x^2+x+y^2)
----------------
(x+y)
还是我理解错了?

x2+x+y2/x+y中分数线?

(x+y)^2+x-2xy/x+y=x+y+x-2xy=2x+y-2xy=2x(1-y)+y