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huyenles287
2 năm trước
Đề bài: C/m giá trị của các biểu thức sau ko phụ thuộc vào giá trị của x a) A= 6(x+2) x^2- 2x+4-6x^3-2 b) B= 2(3x+1) 9x^2- 3x+1- 54x^3
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