1又12分之9+4又12分之8-11分之2
=1+4+9/12+8/12-2/11
=5+17/12-2/11
=5+17*11/12*11-2*12/11*12
=5+187/132-24/132
=5+163/132
=5+1+31/132
=6又132分之31