计算:[(2x - 3y)^2 - (x-y)(4x+2y)] / 2y
问题描述:
计算:[(2x - 3y)^2 - (x-y)(4x+2y)] / 2y
答
[(2x - 3y)^2 - (x-y)(4x+2y)] / 2y
=[(4x^2-12xy+9y^2)-(4x^2-2xy-2y^2)]/2y
=(-10xy+11y^2)/2y
=(11y-10x)/2