-8,5*20/17 + (91/46-53/23):30/23 = -10 +(91/46 - 106/46):30/23 = -10 +(-15/46):30/23 =
-10 - 1/4 = -10,25;
-8,5*20/17 + (91/46-53/23):30/23 = -10 +(91/46 - 106/46):30/23 = -10 +(-15/46):30/23 =
-10 - 1/4 = -10,25;