Найдите значение выражений (2,4+0,78)×(-0,5)-(8,57-19,826):2,01

[latex](frac{24}{10} + frac{78}{100} ) cdot (-frac{5}{10}) - (8 frac{57}{100} - 19 frac{826}{1000}): 2frac{1}{100 }= \ \ = frac{240+78}{100} cdot (-frac{1}{2}) + 11frac{826-570}{1000}:frac{201}{100}= -frac{318}{200}+ 11 frac{256}{1000} cdot frac{100}{201}= \ \ =-frac{159}{100}+ 11 frac{32}{125} cdot frac{100}{201}=-frac{159}{100}+ frac{1407}{125} cdot frac{100}{201}=-frac{159}{100}+ frac{7}{5} cdot 4= \ \ =-frac{159}{100}+frac{28}{5}=frac{-159+560}{100}=frac{401}{100}=4,01[/latex]