2,3*11+1,8*15 6,25*16+18,9*21 9,03*25-10,7*5 12,01*6-9,08*07

1 ) 2 , 3 * 11 + 1 , 8 * 15 = 2 * 11 + 0 , 3 * 11 + 1 * 15 + 0 , 8 * 15 = 22 + 3 , 3 + 15 + 0 , 8 * 10 + 0 , 8 * 5 = 25 + 15 + 0 , 3 + 8 + 4 = 40 + 12 + 0 , 3 = 40 + 12 , 3 = 52 , 3; 2 ) 6 , 25 * 16 + 18 , 9 * 21 = 6 * 16 + 0,25 * 16 + 18 * 21 + 0 , 9 * 21 = 60 + 36 + 4 + 360 + 18 + 18 + 0 , 9 = 400 + 36 , 9 = 436 , 9 ; 3 ) 9,03 * 25 - 10, 7 * 5 = 9 * 25 + 0 , 03 * 25 - 10 * 5 - 0 , 7 * 5 = 180 + 45 + 0, 75 - 50 - 3 , 5 = 175 + 0 , 75 - 3 , 5 = 172 , 75;4 ) 12, 01 * 6 - 9 , 08 * 7 = 12 * 6 + 0 , 01 * 6 - 9 * 7 - 0 , 08 * 7 = 60 + 12 + 0 ,06 - 63 - 0,56 = 9 - 0 , 5 = 8 , 5.