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pinkksora
2 năm trước
Tập Hợp Q Các Số Hữu Tỉ . Bài 1 : Giả Sử x = $\frac{a}{m}$, y = $\frac{b}{m}$ (a,b,m ∈ Z, m ≥ 0) và x ≤ y. Hãy Chứng Tỏ Rằng Nếu Chọn z = $\frac{a+b}{2m}$ thì ta có x ≤ z ≤ y Hướng dẫn : sử dụng tính chất : nếu a, b, c ∈ Z và a ≤ b thì a+c ≤ b+c
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