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在解题时,通过变换思想,能使已知或所求的部分集中到一个基本图形中,为求解创设合适的情境,从而简便地解决问题。下面举例说明:
In solving a problem, by changing ideas, the known or sought-after part can be concentrated in a basic figure, creating a suitable situation for solving, and thus easily solving the problem. The following example illustrates: