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ctvloga350
2 năm trước
Chứng minh biểu thức sau không phụ thuộc vào biến x, y A=(3x - 5)(2x + 11)-(2x + 3)(3x + 7) B=(2x + 3)(4x² - 6x + 9) - 2(4x³ - 1) C=(x - 1)³ - (x + 1)³ + 6(x + 1)(x - 1)
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