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degea0603
2 năm trước
Câu 1: Cho phương trình 3x + 4y = 5 . Khẳng định nào sau đây là sai? A. Phương trình có vô số nghiệm trên R B. Công thức nghiệm tổng quát của phương trình là: C. Phương trình có cặp nghiệm là cặp số tự nhiên D. Phương trình không có nghiệm là cặp số nguyên âm. Câu 2: Phương trình ax + by =c là phương trình bậc nhất hai ẩn, trong đó a, b, c là các số đã biết, với: A. a ≠ 0 hoặc b ≠ 0 và x, y là các ẩn B. a, b là các số nguyên, a ≠ 0; b ≠ 0 và x, y là các ẩn C. a2+b2= 0 và x, y là các ẩn D. a2+b2= 0;x ≠ 0;y ≠ 0 cảm ơn các bạn
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