3A-2[2B+1/2(A-B)]帮助解算一下,
问题描述:
3A-2[2B+1/2(A-B)]帮助解算一下,
答
3A-2[2B+1/2(A-B)]
=3A-4B-(A-B)
=3A-4B-A+B
=(3A-A)+(-4B+B)
=2A-3B