Question

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

Answer 1

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