Найдите значение выражения: 1) –34 + 67 + (–19) + (–44) + 34; 2) 6 + (–7) – (–15) – (–6) – 30; 3) 3 1 +(−2 56 9 )−(−1 7 .12 )

Найдите значение выражения: 1) –34 + 67 + (–19) + (–44) + 34 = -34 + 67 – 19 – 44 + 34 = 4; 2) 6 + (–7) – (–15) – (–6) – 30 = 6 – 7 + 15 + 6 – 30 = -10; 3) 3(1/6) + (−2(5/9)) − (−1(7/12)) = 3(1/6) − 2(5/9) + 1(7/12) = 114/36 – 92/36 + 57/36 = 79/36 = 2(7/36).