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列方程解应用题的关键是要确定一个未知量为x。一般来说,设未知数x通常有直接设法和间接设法两种,而小学阶段主要采用直接设未知数的方法。
The key to solving column equations is to determine an unknown quantity x. In general, there are two direct and indirect ways to set the unknown x, while the elementary one mainly adopts the method of setting unknowns directly.