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(-2)*(-1)*4*(-1)*6/2*(-3) =
{ (-2• -1) • 4• (-1)• 6} /[2• (-3)]=
{2•4• (-6)} / [-6] =
{8• 1}/[1]= 8.
b.
(-7)*(12)*(15)*(-4) / (-49)*6 =
{ 1• 2• 15• (-4)} / [7• 1]=
{30• {-4}/7= -120/7= -17 1/7