-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/09 21:50:00
-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
-2(ab-3a²)-[2b²-(5ab+a²)+2ab]
=-2ab+6a²-[2b²-5ab-a²+2ab]
=-2ab+6a²-2b²+5ab+a²-2ab
=ab+7a²-2b²
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来源:学生作业帮助网 编辑:作业帮 时间:2024/06/09 21:50:00
-2(ab-3a²)-[2b²-(5ab+a²)+2ab] ,
-2(ab-3a²)-[2b²-(5ab+a²)+2ab]
=-2ab+6a²-[2b²-5ab-a²+2ab]
=-2ab+6a²-2b²+5ab+a²-2ab
=ab+7a²-2b²