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phuongnhi.nguyen756
2 năm trước
Câu 4: Chứng tỏ rằng giá trị của mỗi biểu thức sau không phụ thuộc vào giá trị của biến: a) x(x3-x2-3x+2) - (x2-2)(x2+x+3) +4(x2-x-2) b) (x^n+1)(x^n-2) - x^n-3(x^n+3 - x3) + 2009
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