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掌握等腰梯形(一般梯形也是如此)中一些常用的辅助线的做法,是我们解决等腰梯形有关命题的有效途径。
It is an effective way for us to solve the proposition about isosceles trapezoid to master some commonly used auxiliary lines in isosceles trapezoid (the general trapezoid is also the case).