数学题：生产一批零件，第一天生产了180个，第二天生产的比总数的1/4少30个，两天共生产了总数的1/3，一共有多少个零件？【用算术方法解】

数学题解答：（180-30）÷（1/3-1/4）

分析：第二天生产的比总数的1/4少30个，两天产量合并后，从第一天生产的拿30个给第二天，这样第二天正好占总数的1/4，而第一天变成了150个，这150个占总数的：1/3-1/4＝1/12，所以用上面的方法计算。

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