

Mọi số nguyên có phải là số hữu tỉ không?
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9.(x+28)=0
- Vậy x <= bao nhiêu?
- Nếu x khác -28, biểu thức (x+28)/(x+28) bằng bao nhiêu?
- Vậy nghiệm duy nhất phải là bao nhiêu?
- Viết nghiệm của phương trình dưới dạng tập hợp.
- x+28
- Nghiệm là -28, vậy (x - (-28)) = (x+28) là một nhân tử, điều này đúng.
- Kết quả là x bằng bao nhiêu?
- Không, vì phép nhân này không tương đương khi (x+28) = 0.
- Nếu 9(x+28) = 0, thì giá trị của sqrt(
- Bất phương trình này tương đương với x + 28 > 0.
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