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lahaibinhxxx
2 năm trước
Baøi 4. Tìm giá trị của x sao cho các biểu thức A và B cho sau đây có giá trị bằng nhau: a) A = (x – 3)(x + 4) – 2(3x – 2) và B = (x – 4)^2 b) A = (x + 2)(x – 2) + 3x^2 và B = (2x + 1)^2 + 2x c) A = (x – 1)(x2 + x + 1) – 2x và B = x(x – 1)(x + 1) d) A = (x + 1)3 – (x – 2)^3 và B = (3x –1)(3x +1).
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