Toán Lớp 8: Rút gọn nhe
(x-3)^2 – 2(x^2-9) + ( x +3)^2
:vvvvvvvvv
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Toán Lớp 8: Rút gọn nhe
(x-3)^2 – 2(x^2-9) + ( x +3)^2
:vvvvvvvvv
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