作业帮数学分式计算题：(x^2-4y^2)/x^2+2xy+y^2÷x+2y/2x^2+2xy.
数学分式计算题：(x^2-4y^2)/x^2+2xy+y^2÷x+2y/2x^2+2xy.
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化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy