(2*5/6)²-(3²-√1 i 7/9)
(2 *5/6)^2 -[3^2 - V(1 i 7/9)] =
=(10/6)^2 -(9 - V16/9) =
=(5/3)^2 -(27/3 -4/3) =
= 25/9 -23/3=
= 25/9 - 69/9 =
= -44/9 = -4 8/9
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(2 *5/6)^2 -[3^2 - V(1 i 7/9)] =
=(10/6)^2 -(9 - V16/9) =
=(5/3)^2 -(27/3 -4/3) =
= 25/9 -23/3=
= 25/9 - 69/9 =
= -44/9 = -4 8/9