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c) 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + ... + 801 – 802 – 803 + 804 Bài 2. (4 điểm) Tìm x ∈ Z, biết: c) 2x + 5 = x – 1 d) |x – 4| = | -81 | Bài 3. (2 điểm) Tìm x, y ∈ Z, biết: a) xy = -31 b) (x – 2)(y + 1) = 23 Bài 4. (1 điểm) Chứng tỏ rằng không tồn tại các số nguyên x, y, z sao cho: | x – 2y | + | 4y – 5z | + | z – 3x | = 2011 giúp em vs em cần gấp 9h phải nộp rồi ạ
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