{(x+y)²-(x-y)²}÷(-4xy)= (3xy-y)÷y=还有(x+y)²÷(x+y)
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{(x+y)²-(x-y)²}÷(-4xy)= (3xy-y)÷y=还有(x+y)²÷(x+y)
{(x+y)²-(x-y)²}÷(-4xy)= (3xy-y)÷y=
还有(x+y)²÷(x+y)
{(x+y)²-(x-y)²}÷(-4xy)= (3xy-y)÷y=还有(x+y)²÷(x+y)
{(x+y)²-(x-y)²}÷(-4xy)=[x^2+2xy+y^2-(x^2-2xy+y^2]/(-4xy)=4xy/(-4xy)=-1
(3xy-y)÷y=3xy/y-y/y=3x-1