{(x+2y)(x-2y)-(x-2y)²}/2x
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{(x+2y)(x-2y)-(x-2y)²}/2x
{(x+2y)(x-2y)-(x-2y)²}/2x
{(x+2y)(x-2y)-(x-2y)²}/2x
{(x+2y)(x-2y)-(x-2y)²}/2x
=[ (x-2y) ( x+2y-x+2y) ] /2x
= (x-2y) 4y/2x
= 2y(x-2y) /x
解
{(x+2y)(x-2y)-(x-2y)²}/2x
=[(x-2y)(x+2y-x+2y)]/2x
=(x-2y)(4y)/2x
=(4yx-8y²)/2x
=2y-4y²/x
{(x+2y)(x-2y)-(x-2y)²}/2x
=(x^2-4y^2-x^2+4xy-4y^2)/2x
=(4xy-8y^2)/2x
=2y-4y^2/x
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