(x+√y)方(2x√y-x方-y)
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(x+√y)方(2x√y-x方-y)(x+√y)方(2x√y-x方-y)(x+√y)方(2x√y-x方-y)=(x+√y)²×[-(x-√y)²]=-[(x+y)(x-√y)]
(x+√y)方(2x√y-x方-y)
(x+√y)方(2x√y-x方-y)
(x+√y)方(2x√y-x方-y)
=(x+√y)²×[-(x-√y)²]
=-[(x+y)(x-√y)]²
=-(x²-y)²
=-x的4次方+2x²y-y²
(x+√y)方(2x√y-x方-y)
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