3a²b-[2a²b-(2abc-a²b)-4a²c]-abc
=3a²b-[2a²b-2abc+a²b-4a²c]-abc
=3a²b-2a²b+2abc-a²b+4a²c-abc
=abc+4a²c
=ac(b+4a)
当a=-2 ,b =-3 ,c =1时,
原式=-2×(-3-8)
=22
3a²b-[2a²b-(2abc-a²b)-4a²c]-abc
=3a²b-[2a²b-2abc+a²b-4a²c]-abc
=3a²b-2a²b+2abc-a²b+4a²c-abc
=abc+4a²c
=ac(b+4a)
当a=-2 ,b =-3 ,c =1时,
原式=-2×(-3-8)
=22