12 1/2 + (17 1/2 - 8.25 10/11) 8 * (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + (17 1/2 - 7.5) 8 (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 10 8 (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 80 * (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 80 * (35/3 : 20/9 + 7/2)
= 12 1/2 + 80 * (35/3 : 20/9 + 63/18)
= 12 1/2 + 80 * (35/3 : 65/18)
= 12 1/2 + 80 (35/3 18/65)
= 12 1/2 + 80 * (7/1)
= 12 1/2 + 560
= 572 1/2
12 1/2 + (17 1/2 - 8.25 10/11) 8 * (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + (17 1/2 - 7.5) 8 (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 10 8 (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 80 * (11 2/3 : 2 2/9 + 3.5)
= 12 1/2 + 80 * (35/3 : 20/9 + 7/2)
= 12 1/2 + 80 * (35/3 : 20/9 + 63/18)
= 12 1/2 + 80 * (35/3 : 65/18)
= 12 1/2 + 80 (35/3 18/65)
= 12 1/2 + 80 * (7/1)
= 12 1/2 + 560
= 572 1/2