Toán Lớp 8: Tính
b) 3/x^2+2xy+y^2+4/2xy-x^2-y^2+5/x^2-y^2
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Toán Lớp 8: Tính
b) 3/x^2+2xy+y^2+4/2xy-x^2-y^2+5/x^2-y^2
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