abc-[2ab-(3abc-bc)+4abc]其中a=2b=-1/2c=-1

分类: 作业答案 • 2023-01-13 15:09:15

问题描述：

答

abc-[2ab-(3abc-bc)+4abc]
=abc-2ab+3abc-bc-4abc
=-2ab-bc
=-2*2*(-1/2)-(-1/2)(-1)
=2-1/2
=3/2