Toán Lớp 8: A = -3+x-1/4x^2 tính gtln
C = 19 – 6x – 9x^2
D = -x^2-4x-y^2+2y
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Toán Lớp 8: A = -3+x-1/4x^2 tính gtln
C = 19 – 6x – 9x^2
D = -x^2-4x-y^2+2y
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