化简求值：[(3x-1\2y)^2+3y(x-y\12)]÷[(2x+y)^2-4y(x+1\4y)]
问题描述：
化简求值：[(3x-1\2y)^2+3y(x-y\12)]÷[(2x+y)^2-4y(x+1\4y)]
答
原式=(9x^2-3xy+1/4y^2+3xy-1/4y^2)÷(4x^2+4xy+u^2-4xy-y^2)
=9x^2÷4x^2
=9/4