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2 năm trước
A=3x+2/x-3 và B= x^2+3x-7 a, Tính A khi x=1, x=2, x=5/2. b, Tìm x thuộc Z để A là số nguyên. c, Tìm x thuộc Z để B là số nguyên. d, Tìm x thuộc Z để A, B cùng là số nguyên
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