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Obliczam x
P=2(ab+ac+bc)
P=2(2x·3x+2x·x+3x·x)
P=2(6x²+2x²+3x²)
P=2·11x²
P=22x²
22x²=99 /:22
x²=9/2
x=√(9/2)
x=3√2/2
Obliczam objętość
V=2x·3x·x
V=6x³
V=6·(3√2/2)³
V=6·(27√2/4)
V=81√2/2