51+19+3×6-(47-42)-12 по действиям

51+19+3×6-(47-42)-12=70+18-5-12=71

1) 3 × 6 = 18

2) 47 - 42 = 5

3) 51 + 19 = 70

4) 70 + 18 = 88

5) 88 - 5 = 83

6) 83 - 12 = 71