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

问题描述:

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

3a^2b-[2abc-(2abc-ab^2c)+3a^2b]
=3a²b-(2abc-2abc+ab²c+3a²b)
=3a²b-ab²c-3a²b
=-ab²c
不懂的欢迎追问..