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a=krawedź
v=a³= objetośc
2 szescian
a=a-20%=a-0,2a=0,8a
v=(0,8a)³=0,512a³
0,512a³=100%
a³=x %
..................
x=a³×100:0,512a³
x=195,3125%
195,3125%-100=95,3125% o tyle % jest wieksza ta objetośc