выполните действия: 1)(-56):(512)= 2)-3 34:1 12= 3)1 79:(-2 23)=

1) (-5/6) ÷5/12 = (-5/6) * 12/6 = -2
2) (-3 3/4) ÷ 11/2 = (-15/4) ÷ 11/2 = (-15/4) * 2/11 = -15/22
3) 1 7/9 ÷ (-2 2/3) = 16/9 ÷ (-8/3) = 16/9 * (-3/8) = -2/3