They are located in the Moon's orbit, equidistant from both the Earth and the Moon, with which formcongruent equilateral triangles .
他们都位于到月球和地球距离相等的月球轨道上,形成两个等边三角形。
2
By means of congruent transformation in matrix, the method of transforming real quadratic form into standard form and the method of normal orthogonal basis are given in this paper.