[(根号2 + 1 )^2-2(3 - 2根号2)]/ 3 - 2根号2

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[(根号2 + 1 )^2-2(3 - 2根号2)]/ 3 - 2根号2
[(根号2 + 1 )^2-2(3 - 2根号2)]/ 3 - 2根号2

[(根号2 + 1 )^2-2(3 - 2根号2)]/ 3 - 2根号2
[(根号2 + 1 )^2-2(3 - 2根号2)]/ (3 - 2根号2)
=[(根号2)^2+2根号2 + 1 ^2)-2(3 - 2根号2)]/ (3 - 2根号2)
=[2+2根号2+1-2(3 - 2根号2)]/ (3 - 2根号2)
=[3+2根号2-2(3 - 2根号2)]/ (3 - 2根号2)
=-(3 - 2根号2)/ (3 - 2根号2)
=-1