a^2-ac+c^2=b^2+bd+d^2
ab+cd *ad+bc [HIGHLIGHT=#000000][HIGHLIGHT=#ffffff]=ac * b^2+bd+d^2 +bd* a^2-ac+c^2
ab+cd * ad+bc= ac+bd * a^2-ac+c^2 (1
if ab+cd=p
a>b>c>d
ab+cd>ac+bd>ad bc
(ac+bd,ab+cd) =1
in 1
ac+bd *k=ad+bc
تناقض!
contradiction!!!!!!!!!!!!!!!!!!!!!!!
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