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a-2-d-2-ad-b-2-c-2-bc-a-2-b-2-c-2-d-2-ab-cd-ad-bc-




Question Number 57390 by naka3546 last updated on 03/Apr/19
a^2  + d^2  − ad  =  b^2  + c^2  + bc  a^2  + b^2   =  c^2  + d^2   ((ab + cd)/(ad + bc))  =  ?
a2+d2ad=b2+c2+bca2+b2=c2+d2ab+cdad+bc=?

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