EH$06$

"MATLAB:

y$1=0\mathrm{.}5$; y$2=0\mathrm{.}3$; y$3=0\mathrm{.}2$; p$=5$;

T$=$fnul$($@$($T$)1/$p$-$y$1/10^($A$1-$B$1/($T$+$C$1))-$y$2/10^($A$2-$B$2/($T$+$C$2))-$y$3/10^($A$3-$B$3/($T$+$C$3)),400"$