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Bài 6: Tính giá trị biểu thức $a) A=x^{2}+8x \ tại\ x=1996 \\ b) B=x^{3}+ 3x^{2}+ 3x\ tại\ x=99 \\ c) C=4x^{2}- 4x\ tại\ x=\dfrac{1}{4}$
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