{1 5/12 : (-1 1/6) + 2/7* 2,5} / {4 2/3: 7+1 1/6 * (-2/7)} PILNE.!!!
{1 5/12 : (-1 1/6) + 2/7* 2,5} / {4 2/3: 7+1 1/6 * (-2/7)} =
{17/12 : (-7/6) + 2/7* 5/2} / {14/3 : 7+ 7/6 * (-2/7)} =
{17/12 * (-6/7) + 2/7* 5/2} / {14/3 * 1/7+ 7/6 * (-2/7)} =
{(-17/14) + 5/7} / {2/3 + (-1/3)} = {(-17/14) + 10/14} / { 2/3 - 1/3} =
(-7/14) / 1/3 = (-1/2) : 1/3 = (-1/2) * 3/1 = -3/2 = -1,5
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{1 5/12 : (-1 1/6) + 2/7* 2,5} / {4 2/3: 7+1 1/6 * (-2/7)} =
{17/12 : (-7/6) + 2/7* 5/2} / {14/3 : 7+ 7/6 * (-2/7)} =
{17/12 * (-6/7) + 2/7* 5/2} / {14/3 * 1/7+ 7/6 * (-2/7)} =
{(-17/14) + 5/7} / {2/3 + (-1/3)} = {(-17/14) + 10/14} / { 2/3 - 1/3} =
(-7/14) / 1/3 = (-1/2) : 1/3 = (-1/2) * 3/1 = -3/2 = -1,5