数学题~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
展开全部
｛2\3x-2\x+y〔x+y\3x-x-y）｝÷x-y\x
=(2/3x-2/x+xy+y*y/3x-xy-y^2)/x-y/x
=(y^2-4/3x-y^2)/x-y/x
=y^2/x-4/3x^2-y^2/x-y/x
=-4/3x^2-y/x
=-(12+3xy)/3x^2
=(2/3x-2/x+xy+y*y/3x-xy-y^2)/x-y/x
=(y^2-4/3x-y^2)/x-y/x
=y^2/x-4/3x^2-y^2/x-y/x
=-4/3x^2-y/x
=-(12+3xy)/3x^2
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