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D=dł. przekatnej=a√3
a√3=a+2
a(√3-1)=2 /;√3-1
a=2/(√3-1)
a=[2(√3+1) ] / (√3-1)(√3+1)
a=(2(√3+1) ) / (3-1)
a=√3+1
v=a³=(√3+1)³=3√3+9+3√3+1=6√3+10 cm³