l***g
发帖数: 1035 | 1 given a, b and c and the relationship of
a^2 = x^2 + y^2 + xy
b^2 = y^2 + z^2 + yz
c^2 = z^2 + x^2 + zx
express x, y, z in terms of a, b, c....
geometry: can you fit any triangle to a 3-axis coordinate (120 degree apart)
with all three vertices on each axis?
physical: given 3 phase line to line voltage can we recover the 3 phase line
-to-neutral voltage if 3 phases are 120deg apart but not necessarily
balanced? | c******y
发帖数: 8796 | 2 如果都是real number，abc 满足三角形三边定理就应该是唯一解吧。
否则无解
apart)
line
【在 l***g 的大作中提到】
: given a, b and c and the relationship of
: a^2 = x^2 + y^2 + xy
: b^2 = y^2 + z^2 + yz
: c^2 = z^2 + x^2 + zx
: express x, y, z in terms of a, b, c....
: geometry: can you fit any triangle to a 3-axis coordinate (120 degree apart)
: with all three vertices on each axis?
: physical: given 3 phase line to line voltage can we recover the 3 phase line
: -to-neutral voltage if 3 phases are 120deg apart but not necessarily
: balanced?
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