(8/10*5/3у-0,8*0,6)*(5/9у-0,8)=(4/3у-0,48)*(5/9у-0,8)=
4/3у*5/9у-4/3у*8/10-48/100*5/9у+0,48*0,8=
20/27у^2-16/15у-4/15у+0,384=20/27у^2-20/15у+0,384=
20/27у^2-4/3у+0,384=20/27у^2-1 1/3+0,384
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(8/10*5/3у-0,8*0,6)*(5/9у-0,8)=(4/3у-0,48)*(5/9у-0,8)=
4/3у*5/9у-4/3у*8/10-48/100*5/9у+0,48*0,8=
20/27у^2-16/15у-4/15у+0,384=20/27у^2-20/15у+0,384=
20/27у^2-4/3у+0,384=20/27у^2-1 1/3+0,384