Sep14
6a-(5a-4b)+(3a-2b)-b
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6a-(5a-4b)+(3a-2b)-b
6a-5a+4b+3a-2b-b
=4a+b
不知道对不对~
6a-(5a-4b)+(3a-2b)-b
=6a-5a+4b+3a-2b-b
=4a+b
6a-(5a-4b)+(3a-2b)-b
=6a-1(5a-4b)+1(3a-2b)-b
=6a-5a+4a+3a-2b-b
=a+4a+3a-3b
8a-3b
6a-(5a-4b)+(3a-2b)-b
=6a-5a+4b+3a-2b-b
=1a+4b+3a-2b-b
=1a+3a+4b-2b-b
=4a+(4b-2b-b)
=4a+1b