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D = 0,8
D + d = 1
0,8 + d = 1
d = 0,2
D^2 : 2Dd : d^2 =
(0,8)^2 : 2(0,8x0,2) : (0,2)^2
0,64 : 0,32 : 0,04
16 : 8 : 1