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Hoangdanh2270
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8) -2(x- 7)(x + 3) + (5x – 1)(x + 4) – 3x² – 27x 9) (6x -5)(x + 8) – (3x – 1)(2x + 3) – 9(4x – 3) 10) (8x – 1)(x + 7) – (x – 2)(8x + 5) – 11(6x + 1) chứng minh rằng giá trị của các biểu thức sau ko phụ thuộc vào giá trị của biến x
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