PROSZĘ O POMOC
1/3*(1,8+1/5)^2=
1/3=jedna trzecia
1/5=jedna piąta
1/3*(1,8+0,2)^2=1/3*2^2=1/3*4=4/3
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1/3*(1,8+0,2)^2=1/3*2^2=1/3*4=4/3