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列方程解应用题的难点在于正确的列出方程,而正确列出方程的关键在于寻找适当的相等关系,即找出能够表示应用题全部含义的一个相等关系.
The difficulty in solving equation problems is to correctly list the equations. The key to correctly listing the equations is to find the proper equality relationship, that is, to find an equal relationship that can represent the full meaning of the application.