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“希望杯”中的二面角问题丰富多彩,对空间想象能力、逻辑思维能力、运算能力等都有较高要求.本文介绍不作出二面角的平面角,即可简易求解的方法。
The dihedral problem in the “Hope Cup” is rich and colorful, and it has high requirements for spatial imagination ability, logical thinking ability and computation ability. This article introduces a simple solution method that can solve the problem without using the plane angle of the dihedral angle.