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b = 0,8x
P = 0,8x * x = 0,8 x²
P = 64,8
0,8x² = 64,8 /*10
8x²= 648 /:8
x² = 81
x = 9
0,8x = 0,8 * 9 = 7,2
Obw = 2 * 9 + 2 * 7,2 = 18 + 14,4 = 32,4