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Quyen2211
2 năm trước
Mk đang cần rất là gấp! Bạn nào thấy thương thì vào làm giúp mk nha:) Bài 4 (0.5 điểm). Chứng minh A và B là 2 số đối nhau biết : A = a – b + c B = - a + b - c Bài 5 (1 điểm) : a/ Tìm số nguyên n biết : 3n – 5 chia hết cho n – 2. b/ Chứng minh rằng nếu x + 7y chia hết cho 31 ( x, y ∈ Z ) thì 6x + 11y cũng chia hết cho 31. Giúp mk với!
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