3A-2[2B+1/2(A-B)]帮助解算一下,

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

3A-2[2B+1/2(A-B)]帮助解算一下,
3A-2[2B+1/2(A-B)]帮助解算一下,

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