Toán Lớp 9: (x-1/x+2 )^2 -4(x^2-1/x^2-2)+3(x+1/x-2)^2 giúp mk với ạ -

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Toán Lớp 9: (x-1/x+2 )^2 -4(x^2-1/x^2-2)+3(x+1/x-2)^2 giúp mk với ạ