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A2 b b2 c c2 a
A2 b b2 c c2 a pictures 5
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A2 b b2 c c2
A2 b b2 c c2 a
a2(b-c)+b2(c-a)+c2(a-b) u56E0u6570u5206u89E3
a2 b c b2 c a c2 a b 0
a2 b c b2 c a c2 a b are in ap
a2 b c b2 c a c2 a b 1
a2 b b2 c c2 a a b c
