作业帮计算[12(a²b)³b²+3a²(3a²b³-ab²)]÷(3a³b²)要过程
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计算[12(a²b)³b²+3a²(3a²b³-ab²)]÷(3a³b²)要过程
计算[12(a²b)³b²+3a²(3a²b³-ab²)]÷(3a³b²)要过程
计算[12(a²b)³b²+3a²(3a²b³-ab²)]÷(3a³b²)要过程
有243颗外形一模一样的珠子，其中有一颗稍重一点。用一架没有砝码的天平，至少称几次才能找出这颗珠子来？