(1/2-1/3-1/4+1/12)*(-24)
=(1/2)*(-24) -(1/3)*(-24) -(1/4)*(-24) +(1/12)*(-24)
=-12+8+6-2
=0
(-5/6)*(1又1/3)/(-1又2/3)
=(-5/6)*(4/3)/(-5/3)
=(-5/6)*(4/3)*(-3/5)
=2/3
(1/2-1/3)/(-2/3)*1/3
=(1/6)*(-3/2)*(1/3)
=-1/12
(1/2-1/3-1/4+1/12)*(-24)
=(1/2)*(-24) -(1/3)*(-24) -(1/4)*(-24) +(1/12)*(-24)
=-12+8+6-2
=0
(-5/6)*(1又1/3)/(-1又2/3)
=(-5/6)*(4/3)/(-5/3)
=(-5/6)*(4/3)*(-3/5)
=2/3
(1/2-1/3)/(-2/3)*1/3
=(1/6)*(-3/2)*(1/3)
=-1/12