Câu hỏi 26
Tìm tất cả các cặp số thực $(x, y)$ thỏa mãn
$$
3 \cdot \left\{ \frac{3x+2}{3} \right\} + 4 \cdot \left\lfloor \frac{4y+3}{4} \right\rfloor = 4 \cdot \left\{ \frac{4y+3}{4} \right\} + 3 \cdot \left\lfloor \frac{3x+2}{3} \right\rfloor = 18.
$$
$$
3 \cdot \left\{ \frac{3x+2}{3} \right\} + 4 \cdot \left\lfloor \frac{4y+3}{4} \right\rfloor = 4 \cdot \left\{ \frac{4y+3}{4} \right\} + 3 \cdot \left\lfloor \frac{3x+2}{3} \right\rfloor = 18.
$$