文件名称:tree
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1．可让用户选择你的测试例子，也可由用户随意输入待计算的表达式。
2．每单击一次就扩展一个结点。
3．能够显示计算过程。 即在界面中应用相应的按钮，每单击一次就计算一次。
-1. Allows the user to select your test case, the user may also be free to enter an expression to be calculated
2. Each click on the expansion of a node.
3. Able to show the calculation process. That is applied in the interface the corresponding button, click once on each counted once
2．每单击一次就扩展一个结点。
3．能够显示计算过程。 即在界面中应用相应的按钮，每单击一次就计算一次。
-1. Allows the user to select your test case, the user may also be free to enter an expression to be calculated
2. Each click on the expansion of a node.
3. Able to show the calculation process. That is applied in the interface the corresponding button, click once on each counted once
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tree.txt