2(2a-b)-[4b-（-2a+b）] 9a的三次方-[-6a的二次方+2（a的三次方-2a的二次方）]
2(2a-b)-[4b-（-2a+b）] 9a的三次方-[-6a的二次方+2（a的三次方-2a的二次方）]
数学人气：915 ℃时间：2019-08-24 03:56:33
优质解答
2(2a-b)-[4b-（-2a+b）] =4a-2b-4b+（-2a+b）=4a-6b-2a+b=2a-5b9a³-[-6a²+2（a³-2a²）] =9a³+6a²-2（a³-2a²）=9a³+6a²-2a³+4a²=7a³+10a²...
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