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Urarakaochako2k6
2 năm trước
cho các số dương x,y thỏa mãn 7x^2 -13xy -2y^2=0 Tính giá trị biểu thức A= $\frac{2x-6y}{7x+4y}$ giúp mình nha mình cần để nộp gấp cảm ơn các bạn nhìu
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