Tính nhanh: 1. 1379 + 156 - 1379 + 44, 2. 289 + 78 + 111 + 222, 3. 37 x 198 - 37 x 98, 4. 45 x 890 - 73 x 200 - 45 x 790 + 27 x 200, 5. 25 x 63 + 25 x 37 - 150