3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2

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3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2

3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2
3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2

3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2
3倍根号2*根号2/3-根号(2-根号5)^2+1/根号5+2
=2根号3-根号5+2+根号5/3-2/3
=2根号3-2根号5/3+4/3