abc-[2ab-（3ab-bc）+4abc]
=abc-2ab+3ab-bc-4abc
=ab-bc-4abc
=2x(-1/2)-(-1/2)x(-1)-4x2x(-1/2)x(-1)
=-1-1/2-4
=-5.5
abc-[2ab-（3ab-bc）+4abc]
abc-[2ab-（3ab-bc）+4abc]
a=2.b=-2分之1.c=-1
a=2.b=-2分之1.c=-1
数学人气：296 ℃时间：2020-05-25 19:39:08
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