作业帮计算①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/24 07:25:20
![计算①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.](/uploads/image/z/3957961-49-1.jpg?t=%E8%AE%A1%E7%AE%97%E2%91%A027a%26%23179%3Bb%26%23179%3B%EF%BC%8D9a%26%23178%3Bb%26%23178%3B%EF%BC%8D3ab%26%23178%3B%EF%B9%9A%C3%B7%EF%B9%99%EF%BC%8D3ab%26%23178%3B%EF%B9%9A%E2%91%A1%5B%EF%B9%99a%EF%B9%A2b%EF%B9%9A%26%23179%3B%EF%BC%8D2%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%26%23178%3B%EF%BC%8D3%E5%88%86%E4%B9%8B2%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%5D%C3%B73%E5%88%86%E4%B9%8Ba%EF%BC%8Bb.)
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计算①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.
计算①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.
计算①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.
①27a³b³－9a²b²－3ab²﹚÷﹙－3ab²﹚
=3ab²(9a²b-3a-1)÷﹙－3ab²﹚
=-9a²b+3a+1
②[﹙a﹢b﹚³－2﹙a＋b﹚²－3分之2﹙a＋b﹚]÷3分之a＋b.
=﹙a＋b﹚ [﹙a＋b﹚²-2﹙a＋b﹚-2/3 ] *3/﹙a＋b﹚
= [﹙a＋b﹚²-2﹙a＋b﹚-2/3 ] *3
=[ ﹙a＋b-1﹚²-1-2/3]*3
=3﹙a＋b-1﹚²-5