числа a, b, c, d таковы что (a+b)во второй степени + (c+d) вовторой степени = 2(a во второй +b во второй + c во второй+d
(А) a=c и b=d
(Б) a=b и c=d
(В) a=d и b=c
(Г) a=b=c=d
(Д) a+b=c+d

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