(15:5)×(8:4)+(100-89)=

1) (15:5) × (8:4) + (100 - 89) = 3 × 2 + 11 = 6 + 11 = 17 2) 6 × 4 + 15 - (78 - 30 - 5 × 4) = 24 + 15 - (78 - 30 - 20) = 39 - 28 = 11 3) 18 - (30 - 12) + 49 : 7 - 2 × 3 = 18 - 18 + 7 - 6 = 1 4) 93 - 87 - 18 : 6 + 45 - 9 × 5 = 6 - 3 + 45 - 45 = 3 5) 8 : 2 + 2 × 2 + 77 - (76 - 29) = 4 + 4 + 77 - 47 = 8 + 77 - 47 = 38 6) 98 - 24 + (58 - 38) - 4 × 7 + 9 = 74 + 20 - 28 + 9 = 75 7) 77 + 18 - 4 × 6 - 4 + 9 - 4 × 5 = 77 + 18 - 24 - 4 + 9 - 20 = 56 8) 70 - 44 + 16 : 4 - 12 : 2 + 25 = 26 + 4 - 6 + 25 = 49 9) 9 × 9 + 25 : 5 - 7 × 8 + (75 - 68) = 81 + 5 - 56 + 7 = 37 10) 92 - 78 - 32 : 8 + 7 + 33 - 19 = 14 - 4 + 7 + 33 - 19 = 31 11) 74 + (73 - 8 × 8) + 16 : 8 - 44 = 74 + 9 + 2 - 44 = 41 12) 55 - (36 - 9) : 3 + (60 - 53) = 55 - 9 + 7 = 53 13) 29 - (60 - 56) + 16 : 4 + 31 = 29 - 4 + 4 + 31 = 60 14) 94 - 32 - 3 × 6 + 56 : 7 + 7 × 2 = 62 - 18 + 8 + 14 = 66 15) 85 - 66 - (8 × 4 - 12) : 5 + 38 = 19 - 4 + 38 = 53 16) 15 + 50 - (30 - 2) : 7 - 6 × 3 = 65 - 4 - 18 = 43 17) 61 - 49 + 6 × 7 - 6 × 5 + 13 = 12 + 42 - 30 + 13 = 37 18) 24 : 6 + 82 - 29 + (100 - 65) = 4 + 82 - 29 + 35 = 92 19) 80 - 16 : 8 + (82 - 72) - 74 = 80 - 2 + 10 - 74 = 14 20) 9 × (35 : 7 - 2) + 55 - 54 + 16 = 9 × 3 + 1 + 16 = 44