当a大于0,b小于o时,化简|3-2b|+|b-3a|-3|b-a|

问题描述:

当a大于0,b小于o时,化简|3-2b|+|b-3a|-3|b-a|

|3-2b|+|b-3a|-3|b-a|
=(3-2b)-(b-3a)+3(b-a)
=3-2b-b+3a+3b-3a
=3