{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
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{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
(x-y)(z+y-x+y+2y)÷4y
=(x-y)(z-x+4y)÷4y
{( x +y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
=(x-y)(x+y-x+y+2y)÷4y
=(x-y)(4y)÷4y
=x-y
=(x-y)(z+y-x+y+2y)/4y
=(x-y)(z-x+4y)/4y
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{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
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