x+y分之x²+x+y分之y²+2xy等于多少

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x+y分之x²+x+y分之y²+2xy等于多少
x+y分之x²+x+y分之y²+2xy等于多少

x+y分之x²+x+y分之y²+2xy等于多少
x²/(x+y)+(y²+2xy)/(x+y)
=(x²+y²+2xy)/(x+y)
=(x+y)²/(x+y)
=x+y