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:2024/06/20 11:07:03
![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.)
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