9 × { 8 + 7 × [ 6 + 5 × ( 4 + 3 × ( 2 + 1 ) ) ] } : ( 1 + 2 + 3 + ... + 9 ) =
9 × { 8 + 7 × ( 6 + 5 × ( 4 + 3 × 3 × 3 ) ] } : ( 9 × 10 : 2 ) =
9 × { 8 + 7 × ( 6 + 5 × ( 4 + 9 × 3 ) ] } : ( 90 : 2 ) =
9 × { 8 + 7 × ( 6 + 5 × ( 4 + 27 ) ] } : 45 =
9 × [ 8 + 7 × ( 6 + 5 × 31 ) ] : 45 =
9 × [ 8 + 7 × ( 6 + 155 ) ] : 45 =
9 × ( 8 + 7 × 161 ) : 45 =
9 × ( 8 + 1127 ) : 45 =
9 × 1135 : 45 =
10215 : 45 = 227