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Đầu ra Q≡Q(R, S) của một sản phẩm phụ thuộc vào hai yếu tố đầu vào R, S như sau Q2−RS−1RS=R2+4S2
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Đầu ra Q≡Q(R, S) của một sản phẩm phụ thuộc vào hai yếu tố đầu vào R, S như sau
Q2−RS−1RS=R2+4S2...
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