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.
问题描述:
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.
答
①27a³b³-9a²b²-3ab²﹚÷﹙-3ab²﹚=3ab²(9a²b-3a-1)÷﹙-3ab²﹚=-9a²b+3a+1②[﹙a﹢b﹚³-2﹙a+b﹚²-3分之2﹙a+b﹚]÷3分之a+b.=﹙a+b﹚ [﹙...