0.27+0.03*(2-15 1/3)=
0.27+0.03(2-151/3)=27/100+0.03(2-46/3). 27/100+0.03*(-40/3). 27/100-3/100*(-40/3). 27/100-6/15=-13/100=-0.13
Тут ошибка! 27/100-3/100*(-40/3)=27/100+4/10