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一、配凑法。已知f[φ(x)],求f(x)可用此法。例1.已知f(1-x~2)=(1-x~2)/x~2。求f(1/2)。
One, patchwork method. Knowing f[φ(x)], find f(x) using this method. Example 1. Known f(1-x~2)=(1-x~2)/x~2. Find f(1/2).