(20 × 20 – 240) : 8 + 9 = 29
(400 – 240) : 8 + 9 = 29
160 : 8 + 9 = 29
20 + 9 = 29
29 = 29
20 × (20 – 240 : 8) + 9 = 361
20 × (20 – 30) + 9 = 361
20 × (-10) + 9 = 361
-200 + 9 = 361
-191 = 361