Toán Lớp 8: rút gọn biểu thức
(3x+1)^2+(3x-1)^2-2(3x+1)(3x-1)
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Toán Lớp 8: rút gọn biểu thức
(3x+1)^2+(3x-1)^2-2(3x+1)(3x-1)
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