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Cô ơi cho em hỏi bài này với mong cô trả lời BT: a, cho đơn thức a= 5/2.(-2xy^2)^3. Tím các giá trị cửa x,y để A nhân giá trị âm. b,Cho đơn thức B=(3/2 xy^2).5/9 x^4 y^3. Tìm các giá trị của x,y để nhận giá trị dương
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